I have the exact same problem.
After spending 30 minutes on a chat with YouTubeTV support we realized that none of my streaming services worked.
I then spent 20 minutes on a chat with Apple support. They concluded that it was the DisplayLink software that's causing the problem. His hypothesis was that there was a security feature preventing video from being displayed because the screen was being recorded by DisplayLink.
Posting here hoping I get copied on any solutions.
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