I have a Macbook Air with an M1 chip and 16GB of memory.
OS is Version 15.4.1 (24E263).
Apple TV version is 1.5.4.70.
Any attempt to stream video content purchased through the apple store, or Apple TV+ subscription (paid and current) results in the usual apple splash screen, followed by the content warnings (flashing lights, language, etc.) then the video stops and will not play past that point.
If I try to resume something I started on a different device, only a blank player window will display.
Example, trying to stream S1 E1 of Silo. I click play, see the content warnings (Violence, Language, Sexual content), followed by the AppleTV+ logo and fanfare noise. Then a preview for the show Friends and Neighbors starts to play. If I let it play through, the preview will play to the point where it says "New episode every Friday" referring to the preview, then stop. It will not fast forward to any point in the show.
If I attempt to play downloaded content, for example the movie Paul, (which I purchased through the apple TV app and have played many times on this computer and other devices) the player window flashes for a moment then disappears.
Help is appreciated.