[RESOLVED: looks like it was some kind of Roku-to-TV communications problem. I powered the TV off for 30 secs, then on. Roku is now working again. Aggravating, but I'm new to this so guess it's only the standard learning curve.]

I have a Hisense U6G TV about 6 weeks old. I have a little used Roku 3 4200X given me by a friend.

The Apple TV+ app on both was installed since Dec 1, 2020. The Roku OS was updated to latest within the past 4 weeks when I first installed it in my setup. The Android TV OS was updated to latest at somepoint in December. Perhaps it self-updated since then, I do not track it that closely,

I've used these two different devices' streaming capability for a few weeks. The Android TV rarely streams content from Apple TV+: I see the generic "content not available" screen after it times out. The Roku 3 almost always streams Apple TV+ content well. The difference between the two is stark.

The Android TV does a good job streaming Youtube and Amazon Prime content. It even shows the trailer currently (Jan 11) on Apple TV+ for "Macbeth" without a hitch. But it fails repeatedly to stream other Apple TV+ content such as "Ted Lasso" or "1971" or "Dickinson".

The anomaly seems to lie with the Android TV, or with how it interacts with Apple TV+. Any thoughts on why it should do so poorly when the Roku device is almost always able to stream Apple TV+?