Apple TV turns on but gives the message "Unable to play this video"

When I first select Apple TV+ on my Sony TV, everything starts as usual with adds about programs which I can skip or change. But when I try to select one of those programs I get the message that it is unable to play the video. That seems to be the case for every program. This problem has been happening for about one week now. I can stream all other streaming services with no problem. I can also stream AppleTV+ on my computer.

Your help would be appreciated.

[Re-Titled by Moderator]