Stream latest update 8.12.0.2516 -> Error 0

Since I updated Xfinity Stream (to 8.12.0.2516) on 10/6, it shows the following screen when trying to stream any show:

We're Having Some Trouble :: 0
We're sorry, something unexpected just happened.  Please try again.

Error 0

Yes, I've "tried again" (many times).
Yes, I've exited and restarted the app (many times).
Yes, I've completely powered down the tablet, rebooted, and restarted the app (several times).
Yes, I've completely uninstalled and reinstalled the app (twice).

Nothing helped.

Lenovo Tab P11 (model TB-J606F).
I connect with home WiFi only - no data connection.
No other apps on this tablet have problems.
I also have an older Samsung tablet, which has not updated to this version, and Stream works fine on this one.

I understand now why the Xfinity Stream app has a rating of 3.2.  Comcast - please read the reviews.