For more information about the possible causes, visithttps://support.tuya.com/en/help/_detail/K9hutgbg8xr8r. Your users can follow the instructions to troubleshoot the issue. If the settings are correct on the mobile phones of your users, perform the following operations: Log in to the IoT Platform and go to the My Products page. Find the corresponding product and click Entering to Develop in the Operation column. On the page that appears, go to the Product Configuration step. In the Device Notification section, click Settings. On the page that appears, check whether you configure the message push function for the product.