Received 1 year free subscrtion by T Mobile was able to view APPLE TV on IPhone computer and TV. Somehow exited out on TV and now unable to sign back in. Still able to view on IPhone and computer. Help in reactivating on TV. TV device still lis

What is your model TV?

List of Apple TV app-supported smart TVs and third party streaming devices - Apple

What happens when you try to sign in through the in-app Settings (sprockets wheel icon), with the Apple ID account that has the subscription?

• You can sign out for the current account, and sign in with a different account.
• You can sign in with an additional account.
• You can reset the app and sign in with the intended account.
• You can delete the app (if not pre-installed), re-install and sign in with the intended account.

I need to change the email account on my TV to match the one on my other devices, please advise.