Logitech MX Master Frequently Asked Questions Manual page 25

4. Wait a few seconds, and then click Turn Bluetooth On.
5. Check to see if the Logitech Bluetooth device is working. If not, go to the next steps.
Remove your Logitech device from the list of devices and try to pair again
1. Navigate to the Bluetooth preference pane in System Preferences:
o Go to Apple Menu > System Preferences > Bluetooth
2. Locate your device in the Devices list, and click on the "x" to remove it.