Hello, Panzo.
Thank you for using Apple Support Communities.
From what I understand is that you're unable to play Apple TV+ content. Please make sure you're following the steps below:
"Watch on Apple TV (4K, HD, and 3rd generation)
Watch See on the Apple TV app
If you have an Apple TV 4K, an Apple TV HD, or a third-generation Apple TV, you can find Apple TV+ in the Apple TV app.
How to watch on your Apple TV
- Open the Apple TV app
from the home screen. - On the Watch Now screen, scroll down to view Apple TV+ movies and TV shows, then select an item.
- Select “Try Apple TV+ Free” or Subscribe, then follow the onscreen instructions to confirm your subscription."
Watch on Apple TV (4K, HD, and 3rd generation)
If this is what you're already doing, then please reply back with additional details about what you're trying to watch, and the steps you're taking to do so.
Cheers!