Hi @Doremi
Is it possible, that you are confusing the AirPods with the Homepods?
While I don't have a TV-Box 5, I've used AirPods with Android for quite a long time.
IMO it should work: Simply long-press the button on the case while the AirPods are inside until the led flashes white, then select the AirPods in the bluetooth menu of the TV-box.
Best,
r00t