Forgot to say:
I installed the Flic App on the TvBox.
Beside the fact that it runs sideway (like if the TV set was a phone) when I try to add aFlic button, it ask for location permission (correctely):
"You location services are turned off.Android requires location services to be turned on to scan for Bluetooth devices."
"Please tunr on Location services and try again"
When you press to confirm it opens the OS setting for Location (correct) where, being a TvBox, there is only the choice "Use Wi-Fi to estimate location" or "off".
Chosing the first, does not solves the problem. The OS reports still that "no apps have requested location recently"