I’m trying to sign into AppleTV on my not Apple TV
Help me get AppleTV on my TV. I’m enrolled.
1080p,
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What is your model TV?
Does your smart TV support the Apple TV app? The supported TV models are listed.
Unsupported TVs may connect an external streaming device that does support the Apple TV app. That can be an Apple TV box, or a third party streaming device. Those devices are also listed.
List of Apple TV app-supported devices - Apple
All the ways to watch Apple TV+ - Apple Support
Once you have access the the Apple TV app through your TV, then open the app, and sign in through the in-app Settings (sprockets wheel icon) with your Apple ID account that has the Apple TV+ subscription or iTunes Store movie purchases.