When a pairing is accepted or rejected through notification actions a new DeviceFragment was created but this fragment was never actually attached to the fragment manager so not displayed to the user.

Request a pairing from the desktop and Accept or Reject the pairing on Android using the notification Action buttons

When you accept the pairing the DeviceFragment should be shown for the device, the action bar title should be set to the devices name and the device should be selected in the NavigationView

When you reject the pairing the PairingFragment should be shown