Apple TV still uses old ID
How do I get Apple TV to log in with my new Apple ID? I recently changed as I got rid of an old email address but when I get on my TV it still defaults to the old ID.
UNU8000
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If you have the Apple TV app as an app on your smart TV, then you can use the reset functionality.
Reset the Apple TV app - Apple Support
If you have the Apple TV box, then your can reset to factory settings.
Reset or restore your Apple TV to its factory settings - Apple Support