Attached please find 2 screenshots showing the TV.Xfinity.com diagnostics.
I am using the Chrome Browser which stopped supporting Adobe Flash Player beginning in 2020. I'm not sure that is relevant. I can stream without out error the LIVE TV. The error occurs when I try to stream Below Deck S2E5.
While writing this, I decided to set my Ghostery extension to "Trust Site". That fixed this problem.
I posted this in case it helps others.
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