If you have a Chamberlain myQ garage door opener, you may occasionally need to resync the device. Here's how to do it:
1. Make sure your garage door opener is connected to the internet.
2. Open the Chamberlain app and tap on the menu icon in the top-left corner of the screen.
3. Tap on MyQ Devices and then select your garage door opener from the list of devices.
4. Tap on the Resync button and then follow the instructions on screen.
That's all there is to it! If you have any trouble, make sure that your garage door opener is within range of your router and that both devices are turned on and connected to the internet.