My Apple TV doesn’t recognize my account.
How do I get my Apple TV app to work/recognize my account?
On what device is this happening?
Is this for a new account, or for an account that is known to be working on other (Apple) devices?
How to create a new Apple ID - Apple Support
Apple ID - Official Apple Support
Verify that the account details are complete and verified. The email address should be confirmed through a test message. Add a valid payment method.