FAQ

If your YoLink smart device shows as "offline," if you have a hub, don't worry, it is still functional. The only device that connects to the internet is the Hub; all other devices connect to the Hub through a digital handshake. To conserve energy, these devices only send signals to the Hub intermittently, with different spacing intervals depending on the device. For example, a water leak sensor sends a signal to the Hub every 4 hours, while a smart plug sends a signal every half hour. When the devices detect any status changes, they immediately send signals to the Hub. The "offline" status only means that the Hub was not connected to the internet at that time. In reality, these sensors and plugs never directly connect to the internet. The devices will automatically reconnect to the Hub within 4 hours, but they will reconnect immediately if there are any status changes. Alternatively, you can press the set/power button on the device to connect it to the Hub immediately. If you take out the batteries of sensor, it won't alert you immediately, but it will send an offline alert within 8-12 hours.

To update your payment information in the YoLink app, go to Settings > Quotas and Usage Limits > Subscription > Payment Portal and update your payment details as needed. If you encounter any problems, contact YoLink customer support.

You can get the API Key from YoLink App->Menu (3 bars)->Settings->Account->Advanced Settings->User Access Credentials.

Please follow the documentation on http://doc.yosmart.com/docs/protocol/openAPIV2/

The API server should be https://api.yosmart.com

So, you should POST http://api.yosmart.com/open/yolink/token to get the access_token through your UAC, just as described in the documentation.

Please refer to the documentation:

1): Get device data through API:

http://doc.yosmart.com/docs/yolinkapi/THSensor

2): Get data reported by device through MQTT:

http://doc.yosmart.com/docs/protocol/openAPIV2#mqtt-api-v2

Text messages sent from our platform to customers' phones are not without cost; in fact, they incur a substantial expense, particularly when usage crosses into the tens of thousands.

We take pride in offering competitively priced, top-quality smart home products. In addition, our commitment extends to providing uninterrupted and excellent service. While we will continue to ensure that emails and App push notifications remain complimentary throughout the lifetime, the SMS service has proven to be an escalating financial burden, reaching thousands of dollars each month and showing no signs of slowing down. Customer accounts are automatically given a limited number of free SMS messages per month, based on the number of registered devices (one account has 5 default quotas and one device has 5 free quotas).

A handful of our customers activate the SMS service across all their devices, thereby incurring significant costs for each customer, upwards of $20 monthly per device. To sustain the viability of YoLink and its progression, we find ourselves in the position of needing to request that our customers exercise restraint in their use of SMS, reserving it solely for significant events like water leak detection and security alarms.
Our unwavering commitment is to present unparalleled products at unbeatable prices, complemented by exceptional support in the realm of smart home technology. However, due to the substantial operational outlay associated with SMS services and the necessity to provide consistently dependable service to all users, we are compelled to adjust our approach to SMS notifications.



Consequently, we have formulated a plan to furnish a predetermined allocation of complimentary SMS messages per month to every customer account, based on the count of registered devices. Upon reaching this threshold, the feature will experience limitations, and we recommend utilizing SMS only when truly necessary. As a further step, unlimited SMS services will now be exclusively extended to our subscription-based clientele.

To receive SMS notifications on YoLink app, follow these steps:

1. Add your phone number by going to Menu -> Settings -> Account -> Phone.

2. Enable SMS notifications by going to Menu -> Settings -> Account -> Advanced Settings.

3. Under Alarm Strategies in Settings, select the default strategy or the one related to your sensor and set SMS notification to Admin.

To receive email notifications on YoLink, please follow these steps:

1. Verify your email address by going to YoLink App -> Menu (upper left) -> Settings -> Account -> Email.

2. Enable email notifications by going to YoLink App -> Menu -> Settings -> Account -> Advanced Settings -> Enable email notifications.

3. Find the strategy related to your sensor (assuming it is the default strategy) by going to YoLink App -> Menu -> Settings -> Alarm Strategies. Set the email notification to Admin in the strategy.

To receive app push notifications and sound alarms on your iPhone for YoLink, please follow these steps:

1. Enable push notifications by going to YoLink App -> Menu (three lines in upper left corner) -> Settings -> Account -> Advanced Settings -> Enable Receive Push Message.

2. Set up app notifications by going to YoLink App -> Menu (three lines in upper left corner) -> Settings -> Alarm Strategies -> Tap the strategy related to your sensors -> In the Send App Notification area, set it to Admin. You can also customize push tones and set up critical alerts by tapping Notification Settings.

3. Test your app push by going to the YoLink app's device screen and tapping the question icon (in upper right corner). Then tap Diagnosis of Device Alarm.

4. Go to your iPhone settings, search for YoLink, tap Notifications, and verify that Allowed Notifications, Sounds, and Badges are enabled. If desired, also enable Critical Alerts.

To change the notification alert sound for YoLink on your iPhone, open the YoLink app, then go to Menu (in the upper left corner) -> Settings -> Alarm Strategies -> Find the strategy that is related to your sensors. In the "App Notification" area, tap "Notification Settings" to change the notification sound or set up critical alerts.

To invite a member to your YoLink account, they must first sign up for their own YoLink account and verify their email address through the YoLink app's Settings. Once they have done this, you can log in to your account and go to Menu -> My Home -> Home Users -> Invite User to invite the member. You can share an invitation code, which they can paste into their phone's browser, or send a QR code for them to scan within the YoLink app. After the invitation is complete, you can set up related notifications to All under Menu -> Settings -> Alarm Strategies -> In Strategies Settings. Additionally, you can set up different permissions for the member under Menu -> My Home -> Permissions and choose their permission level by swiping left under Home Users.

Are you using your website credentials to log in to the YoLink App? If so, please note that you need to sign up for a separate account within the YoLink App. The website and app do not share login credentials, so you must create a new account within the app to access its features.

The terms in YoLink's Advanced Settings of Automation are as follows:



Save execution log: Enabling this option allows you to check the automation history.

Retry when action fails: If this option is enabled and a behavior fails, the automation will retry that behavior (1 to 3 times).

Continue if action fails: Enabling this option allows the automation to proceed to the next behavior if a behavior fails. If it is disabled, the automation will be aborted if the behavior fails.

Notify me if action fails: This option sends you a notification if a behavior fails.

Interval of continuous execution: This option allows you to set a time interval (e.g., 1 hour) for an automation. For example, if you set up an automation to start a siren alarm when a door is opened, and the interval is set to 1 hour, the automation will only execute once per hour, even if the door is opened multiple times within that hour.

To move your devices to another home on YoLink, you need to follow these steps:

1. Delete the devices in the first home by going to the device details screen (tap the three dots in the upper right corner on the device screen), scrolling down, and selecting "Delete Device."

2. Switch to the second home by going to YoLink App -> Menu -> My Home -> Switch to another home.

3. Scan the QR code to add the devices to the second home. You can save the QR code on the device details screen so that you don't have to go to the installation location to scan the actual devices.

You can set up two scenes to arm or disarm your system. Here are the steps:

Armed scene: Add behavior -> Choose alarm strategy -> Select the strategy related to your door sensor -> Choose advanced settings -> Set notifications to Admin, All, or None (if desired) -> Select "Siren Alarm" in the Trigger Action area -> Save.

Disarmed scene: Add behavior -> Choose alarm strategy -> Select the strategy related to your door sensor -> Choose advanced settings -> Set notifications to Admin, All, or None (if desired) -> Deselect "Siren Alarm" in the Trigger Action area -> Save.

Once you execute the armed scene, a door open will trigger a siren to start an alarm. If you execute the disarmed scene, the door open will not trigger a siren.

 Currently, one hub can support updating the firmware of up to four devices at the same time. However, it is recommended to update the firmware of devices one by one to avoid a slow and potentially high failure rate.

No, YoLink devices can only be bound to one account at a time. However, you can invite others as members of your account to share access to the device.

If you encounter the "device cannot be bound" error, please contact YoLink support and provide them with the device's SN number (located at the bottom of the QR code) or the EUI number on the scanning screen in the app. YoLink support will assist you in resolving the issue by obtaining the necessary device information.

I got a new phone and cannot access my YoLink account as I don't remember my username. What should I do?

If you have forgotten your YoLink account username, you can contact (https://shop.yosmart.com/pages/contact-us-page) YoLink support and provide them with your associated email address, phone number or the SN number of your hub. They will send you your username so that you can reset your password and regain access to your account.

No, you will not lose any data. All your data is saved on our encrypted cloud server. Whether you use a new hub or phone or reinstall the app, your settings will remain intact.

If you are experiencing slow loading times in the app, please try force closing the app and restarting it to see if that resolves the issue. It's also important to ensure that your app version is up to date. The app screen operates similar to a web page and may need to be refreshed if it has been open for an extended period of time. Additionally, if the app has been running in the background for an extended period of time or if you have many apps open at once, the app process may be terminated due to limited RAM.

Please go to YoLink app->Menu(3 bars in upper left)->Settings->Account->Advanced Settings->Delete Account

YoLink devices only send signals to the Hub at specific intervals to save energy, and the interval varies by device type. For example, the water leak sensor sends a signal to the Hub every 4 hours, while the smart plug sends a signal every half hour. If there are no changes detected, the device will not send a signal until the next interval. Therefore, when you remove the batteries from a sensor, the Hub may not receive the notification immediately, but within 2 to 3 intervals (8-12 hours), it will receive the notification and alert you. Additionally, the app continually shows the battery level of your sensor. Once it drops to 1 bar, you will receive alerts to remind you to change the batteries. 

Yes, currently, you can use the filter function in the Smart section->Automation->Then behavior to create more complex automations.

For sensors, the firmware update will not occur immediately after confirming the update in the app. It can take up to four hours to complete. Alternatively, you can manually trigger the update by pressing the "set" button on the sensor.

Please follow these steps to troubleshoot:

1. Remove the batteries from the device.

2. Press the SET button on the device five times.

3. Reinstall the batteries.

4. Attempt the firmware update again.

The diagnosis test only checks the app and email notifications. It doesn't send a test SMS code or trigger the siren alarm or speaker hub. If you want to test the devices, you can simulate an event and see if the system responds accordingly.

Yes, you can add multiple homes to one YoLink account, but you will need an additional YoLink hub for the second property. However, please note that if you create two homes on the YoLink app, Alexa/IFTTT/Google will only recognize the main home. Therefore, it is recommended that you add all devices to the same home and create different rooms to distinguish them.

You can change the email associated with your YoLink account by going to the YoLink app and navigating to Menu > Settings > Account > Email, where you can update your email address.

The event history in YoLink app is stored for 6 months.

If your device is a sensor, it may not be shown in the behavior options when editing a scene. Sensor devices are designed for receiving notifications only and cannot be controlled to turn on or off.

The alarm strategy only applies to devices that can trigger alerts, so for your plug device, notification is disabled. You can only receive offline notifications for it.

To cancel your subscription, go to the YoLink app, tap the three-bar menu icon, select "Settings," then "Quotas and Usage Limits," followed by "Upgrade." From there, you can choose to unsubscribe.

Currently, we offer two plans - Starter and Standard - which provide additional monthly quotas for emails, SMS, and phone lines. Here's what you will get for each subscription:

Starter Plan ($1.99)

>> Additional 200 SMS, additional 5000 emails, and 10 phone call alerts/month

Standard Plan ($4.99)

>> Additional 500 SMS, additional 30000 emails, and 100 phone call alerts/month

However, we do not currently offer an unlimited SMS messaging subscription option. You can access these plans by going to the YoLink App menu, selecting Settings, and then selecting Quotas and Usage Limits. The monthly limit refreshes every first day of the month.

To rename a device on YoLink, please follow these steps:

1. Go to the YoLink app's device page.

2. Tap the three dots (in the upper right corner) to go to the Device Details screen.

3. Edit the device's name in the Name area.

To check the version of the YoLink app, please follow these steps:

1. Open the YoLink app.

2. Tap the menu button (three lines in the upper left corner).

3. Select "About YoLink" to view the app version.

4. To ensure that your app is up to date, you can also check the Apple App Store or Google Play Store.

The purpose of "Trigger Actions" is to specify what action(s) should be taken when a sensor detects an alert. For example, if you have a siren linked to the sensor and have selected "trigger siren" in the strategy settings, the siren will start an alarm when the sensor detects an alert. Similarly, if you have a speakerhub linked to the sensor and have selected "trigger speakerhub," the speakerhub will speak the default notification message. You can also choose to trigger a scene as an action.

Unfortunately, YoLink currently only supports monthly payment options and does not offer an annual payment option.

If you started your subscription say halfway through August, your payment will be good for the remaining days of August until the end of September however you will be charged on September for your payment for October. For example, on August 14, you started your subscription of $1.99. You will be given additional 200 SMS, 5000 emails, and 10 phone calls to use for August 14-31. Your quota will refresh on September 1 and you will have again 200 SMS, 5000 emails, and 10 phone calls to use for September 1-30 however you will be paying $1.99 on September 14 as your payment for the month of October.

Yes, you can change the order of the rooms by tapping on the "Rooms" menu (three bars at the top right corner) in the YoLink app. Currently, you can choose to sort the rooms by name or date.

Unfortunately, currently the YoLink app does not display the D2D pairing status.

Firmware updates can consume more power and cause voltage fluctuations, which can cause the battery level to appear low. Please wait for a while and it should return to normal.

Yes, YoLink account passwords should not include spaces

To prevent YoLink system email notifications from going to your Junk folder, you can whitelist the system email address "no-reply@yosmart.com" in your email provider's settings. Alternatively, you can set up a receiving rule to ensure that emails from YoLink are not marked as Junk.

An emergency call alert is an additional type of notification available for your emergency devices, such as water leak sensors and smoke detectors. However, this feature requires a subscription. With the subscription starter pack, you can receive up to 10 call alerts. Please note that each emergency device can trigger a call alert only once per day.

Pelase note only emergency devices are capable of triggering the call alert. Other devices like temperature and door sensors do not have this capability. In addition, when you receive a call alert, you will hear a recorded audio message, not a live person.

YoLink does not provide an option to clear the warnings manually. The warnings will disappear once the device returns to normal or the issue causing the warning is resolved.

You can delete a room by going to the YoLink App, selecting "Menu," then "Settings," then "Rooms," and finally swiping left on the room you want to delete.

You can change the temperature unit for non-temperature sensors, in YoLink app by going to Menu -> Settings -> Locale and selecting "Celsius" as your preferred temperature unit.

Currently, YoLink does not support rearranging the order of devices. However, you can edit the name of the devices and they will be sorted in alphabetical order.

 If you need to create more homes, you can subscribe to YoLink's Starter (which allows up to 10 homes) or Standard (which allows up to 30 homes) plan. The free plan allows each user account to create a maximum of 5 Homes.

The options Default, Effected when away, and Always are simply aliases. You only need to enable the strategy that is related to your devices (usually Default). Additionally, the strategies can be deleted, except for the default strategy.

Please ensure that you are scanning the QR code on the device itself, and not on the box. Also, try placing the device on a white piece of paper before scanning the QR code to improve the scan accuracy. If the issue persists, please contact YoLink support for further assistance.

Please ensure that the app version is 1.40.9 or higher before proceeding. To make the switch, follow this step:

>> Go to the device details page -> signal and follow the instructions provided.

***Please be aware that some UC products may require a specific firmware version to support this conversion. If the current firmware is incompatible, the UC products must first undergo a firmware update. To facilitate this process, a UC hub is required. In case you don't have a UC hub, please contact support so we can temporarily switch your EC hub to UC version to perform the firmware update. Once the update is completed, we will switch the hub back to EC.

***As of now, the conversion is supported by the following models: YS7704, YS6604, YS7201, YS7104, YS7707, and YS4909. If you would like to convert a different model, please contact Yolink support.

Usernames cannot be changed. If you need to use a different username, it's advisable that you start over by deleting your current account then creating a new one with your preferred username.

No, YoLink app does not currently support changing the admin of an account. In order for another person to take over as admin, you will need to delete the device from your account and have the new admin sign up for a new account and scan the QR code to bind them. It is recommended to take screenshots of the QR code on the device details screen before deleting the device, so that the new admin does not need to go to the installation location to scan the code.

To do so, proceed to the 'Permissions' page and choose the permissions you intend to remove. You'll find a delete button positioned to the left of the save button in the top right corner.

The webstore and the Yolink app use different login credentials. The webstore is only for purchases while the app is only for monitoring and managing your devices. Since our online shopping website and our YoLink app are using different systems, the account for our website and the account for our YoLink app are separated and cannot be interchanged.

Automations in our system are not designed to be manually triggered, that is through Scenes. Consequently, on the permission settings page, you will find that the option to execute is not available.

For Android phones, you can choose a ringtone for your Yolink notifications by going to your phone's system settings. It may vary per phone model but as a general guide, go to settings -> app settings -> look for the Yolink app -> notifications -> notification categories -> YoLink Alert/miscellaneous.

Before being able to use the garage controller or YoLink finger in an automation or assign it to a fob’s button, you need to enable first the “control of security devices”. From your app’s main page, go to the menu at the upper left-hand corner> settings> account> advanced settings> control of security devices. 

To ensure invited users doesn't receive extra notifications, please follow these steps:

Upgrade your Yolink App to version 1.40.18 from the App Store.

Once the upgrade is complete, navigate to the 'Alarm Strategies' page within the app.

In the detailed settings page of all Alarm Strategy options, change both 'Send App Notification' and 'Send Email' to 'Authorized Users'.

Presently, this permission is exclusively accessible to specific CSID customers. If you are utilizing the API via CSID, you can request this permission by furnishing us with the following details: Your CSID, Device size, Purpose for data access.

Kindly forward this information via email to yaochi@yosmart.com, and our team will promptly evaluate your request. However, it's important to note that support for this permission is currently unavailable if you are accessing the API through UAC.

To address the frequent sign-in requests, please follow these steps: 1. Open the Yolink App and access 'Settings' by tapping on the three green lines in the upper left corner of the screen. 2. In the 'Settings' menu, select 'Account.' 3. Within the 'Account' section, locate the 'Auth Valid' option and switch it off. Following these steps should prevent the app from repeatedly prompting you to sign in. However, if the problem persists, we recommend uninstalling the app, reinstalling it, and logging in again.

This occurs because each 'Home' can only have one administrator account. To avoid confusion between devices associated with different administrator accounts, you must switch 'Home' to view devices belonging to other 'Home's.

Please try to disable any active VPN connections and rely solely on cellular data.

Please note that Android doesn't currently offer support for Critical Alert and Ringtone settings; this feature is exclusive to iOS. For iOS users, please adjust the region settings on your phone to the United States.

The new App will be launched in the third quarter of 2024 and will be compatible with various tablets.

We recommend changing the service area and make sure the sensor is listed on the device list.

System may have more than one hub without any issue. The device will automatically select a hub with the better signal to connect.

Please set up the phone number first that you would like your texts to be sent to. 

Navigate to the upper right corner and click on 'Information' -> Go to 'Service Area' -> Choose 'United States' -> Finally, restart the application.

To add your new credit card information, please follow these steps within the YoLink app:
1. Navigate to Settings.
2. Select "Quotas and Usage Limits."
3. Press the virtual card option.
4. Choose "Payment Portal."
5. Scroll down, and you'll find the option to "+Add payment method."
By following these steps, you should be able to securely update your payment information. 

Navigate to the menu, then select settings > locale settings > diagnose timezone. This will synchronize the timezone for both the YoLink app and devices.

After syncing the timezone, recreate the timer or automation you previously set up for the relay.

Please note that at this time, Android doesn't natively support critical alerts as iOS does, and it lacks similar functionalities.

Please do the following:

1. Open the Yolink App and go to 'Settings' by tapping on the three green lines at the top left of the screen.
2. In the 'Settings' menu, choose 'Account.'
3. In the 'Account' section, find the 'Auth Valid' option and turn it on. Following these steps should activate fingerprint unlock.
4. In addition, make sure that the necessary permissions are granted to the Yolink App in your phone's settings.

Invited users do not have the privilege to delete devices from the YoLink account. This functionality is reserved solely for the admin user. Although invited users may observe the delete button on the device details page, they cannot utilize it to remove devices from the account.

Please make sure the alarm strategy notification has been set to "ALL".

There is currently no limit on the number of home users you can add. 

No, you do not need those credentials as you can simply log in using your Home Assistant credentials.

 No, YoLink uses a proprietary protocol based on LoRa, and it is not compatible with Zigbee or Z-Wave systems. However, if your Zigbee or Z-Wave devices work with Alexa, YoLink can work with them through Alexa integration.

No, YoLink does not currently support integration with Apple HomeKit. However, you can use it through home assistant by referring to the following links:

https://www.home-assistant.io/integrations/yolink/

https://github.com/dkerr64/homebridge-yolink

Unfortunately, YoLink does not currently support integration with Samsung SmartThings. However, YoLink is planning to support Matter, which would allow for integration with Samsung and other smart home platforms in the future.

Unfortunately, YoLink does not currently support integration with Smart Life. However, YoLink is planning to support Matter, which would allow for integration with Smart Life and other smart home platforms in the future.

Currently, YoLink does not have plans for Hubitat integration but it may be considered in the future. However, a Hubitat Community developer has created an app and drivers to allow the YoLink devices to be used with Hubitat in conjunction with the YoLink Mobile app. This is a 3rd-party solution over which YoLink has no affiliation or control and therefore does not provide support nor can we answer any questions regarding it. For additional information or to contact the developer, please refer to the Hubitat Community Topic entitled “[RELEASE - BETA] - “YoLink™ Device Service” app and drivers to connect Hubitat™ to YoLink™ devices” at https://community.hubitat.com/t/release-beta-yolink-device-service-app-and-drivers-to-connect-hubitat-to-yolink-devices/96432

No, YoLink products are not compatible with the Tuya app.

Please try Alexa app -> "Add" -> "Device"  ->  "Other" -> "Can't find a matching logo" -> "Not Sure"

The YoLink door sensor can interact with Alexa in two specific ways:

1. Alexa Routine Trigger: The YoLink door sensor can be used to trigger Alexa routines based on its status (Open or Close). For example, you can set up a routine in the Alexa app where if the YoLink door sensor detects that a door is opened, it can trigger other smart devices or services. This could include turning on lights, playing music, or sending a notification to your phone.
2. Voice Query for Status: You can ask Alexa about the status of your YoLink door sensor by using a voice command. For instance, you can say, "Hey Alexa, what is the status of [name of the door sensor]?" Alexa will respond with the current status of the sensor, such as whether the connected door is open or closed.

Because of this, you can enable or disable Alexa routines using voice commands. To do this, simply say "Alexa, enable [routine name]" or "Alexa, disable [routine name]" to your Alexa-enabled device. This command will activate or deactivate the specified routine. 

Yes, you can set up a routine in Alexa to trigger a scene in YoLink. First, make sure you have discovered the new scene in the Alexa app. Then, set up a routine, selecting "when this happens". Choose "voice" as the trigger, and then set the phrase you want to use to arm or disarm the system. For example, you could say "Echo, arm my home". Then, add the action "Smart Home", select "Control scene", and choose the scene you want to execute. Finally, save the routine and you'll be able to use your voice to control your YoLink system.

Unfortunately, YoLink does not currently support geofencing. However, you can use the IFTTT app to integrate geofencing with the YoLink app. To set it up, download the IFTTT app and follow these steps:

1. Create a new applet and select "If This"

2. Search for "Location" and select the trigger for entering or exiting a designated area

3. Select "Then That" and search for YoLink, then choose the action to execute a scene.

The direct pairing method is called YoLink Control or D2D, which is a unique technology of YoLink system. It can work without an internet connection, but the functions such as automation and notifications in the app require an internet connection. For example, you can set up YoLink Control between a water leak sensor and a valve controller, so that when the sensor detects water, the valve will close automatically without the need for internet. However, you will not receive notifications without an internet connection. Additionally, you can set up automations in the app, such as closing the valve when water is detected, but this will not work without an internet connection.

To use the YoLink skill with Alexa, you can try changing the region of your Amazon account to the United States. Please follow this link for instructions: https://www.amazon.com/gp/help/customer/display.html?nodeId=201248840. Alternatively, you can create a new Amazon account with a US region setting to use the YoLink skill with Alexa.

Please remember to use your account username, not your email address. It's important to ensure both your password and username are accurately entered.

To prevent excessive usage and ensure fair access for all users, the UAC API imposes restrictions on individual API users in two primary ways:

1. Within a 5-minute sliding window, a single UAC is limited to making no more than 100 API calls.

2. Within a 1-minute sliding window, a single target device can receive no more than 6 API calls, with a minimum interval of 200 milliseconds between each call.

The UAC does not support http callback functionality.

The response from the access_token retrieval interface also includes information about the token's validity period, typically lasting for 2 hours.

Due to security concerns, YoLink sensors are not supported for use with other quasi-LoRaWAN gateways.

The upcoming product lineup for this year (2024) includes a Hub that is designed to work with Local API. Additionally, other Lora terminal devices can also utilize Local API functionality through this Hub.

Check whether there are special characters in the value of client_secret. If there are special characters, the parameter value needs to be url_encoded. Or submit using json.