I have a Sony Bravia X750F, 55-inch, running Android 7.0 with Android TV. For some reason, Sony has decided that only their $2,000+ "Triluminos" TVs are compatible with Bluetooth headphones. When I try to pair Bluetooth headphones or speakers to the TV, it doesn't even show them in the Bluetooth pairing menu. I'm able to pair other Bluetooth devices like a game controller or keyboard just fine.
Is there any workaround to this blatant lockdown with no real technical limitation whatsoever?
Yes, plug a Bluetooth transmitter (like this , but there are many) into the headphone out jack of the TV (and USB port for power,) and pair your Bluetooth headphones to that.