Wireless
Forgetting a Bluetooth device (such as AirPods) on a Mac will erase all of your Mac’s saved data about how to connect to the device. So, when you reconnect the devices to your Mac, it will be as if the devices are connecting for this first time.
Why this works:
If your Mac or AirPods have updated, it may affect the way they connect to other devices. By forgetting AirPods as a device on your Mac altogether, you can start over like new. This gives your AirPods an opportunity to make a new, clean connection to your Mac.