Can’t sign into Apple TV+ on new Sony tv

Hello and welcome to Apple Support Communities, Moniquets.

If we understand your post correctly, you are trying to sign in to the Apple TV app on your smart TV. We’d like to help.

We see you were viewing "Watch movies, TV shows, and live content in the Apple TV app" and it did not resolve your issue.

See if the steps in this article helps:

If you can't watch or stream movies and TV shows in the Apple TV app

1. "Check the System Status page for service interruptions or check a third-party provider's website for any interruptions. If there are service interruptions, try to stream or watch the video later.
2. If you're having trouble logging in with your Apple ID, you can reset your Apple ID password or learn how to get a verification code and sign in with two-factor authentication.
3. If your cellular connection is poor, connect to Wi-Fi instead.*"

Make sure your TV is connected to a good stable Wi-Fi: Resolve Wi-Fi and Bluetooth issues caused by wireless interference

Also, you may need to check to see if there aren't any blocked ports: TCP and UDP ports used by Apple software products

Thanks for using the Apple Support Communities.