Bluetooth devices can be paired with only one device such as Apple TV, Mac, iPhone, and so on. Therefore, if you want to use the Bluetooth device on another terminal, you need to cancel the pairing once. For example, when using a Bluetooth speaker that was used with Apple TV on an iPhone. Learn how to connect Bluetooth speakers to Apple TV.
Apple TV - Connect to Bluetooth Speaker
So, here we will see how to unpair the Apple TV and the Bluetooth device.