I have a question about this. Does one need the latest Apple TV beta to get single sign-on to work? I don't have the ATV beta, but I do have 10.2 beta 6, and signed on to a provider, but the ATV didn't change its login settings at all (I was signed in to a different provider than the one I signed into on my iPhone).Up to 9 TV providers now (matching the list in the Apple press release yesterday):