i had that issue too but with android tv 9 (mi stick tv) my solution was to pair it then turn off the device (stick tv) then turn it on and in the middle of the boot , put out of the box my headphones they will start to sync right after the boot and the audio will work normal again.
i had that issue too but with android tv 9 (mi stick tv) my solution was to pair it then turn off the device (stick tv) then turn it on and in the middle of the boot , put out of the box my headphones they will start to sync right after the boot and the audio will work normal again.