There is an old AppleTV 3 that I was using in a spare bedroom as an airplay device without a TV (just speakers attached). I realized it wasn't working and brought a TV in there to see. Well, it wanted me to sign in with my Apple ID. I did, and then my phone gave me the message that someone was signing in and here is the passcode to verify with two factor. Problem is the ATV3 does not ever ask you for that code. Is there a setting somewhere to turn on 2 factor on the Apple TV?