Xfinity Streaming not working on my Apple TV

I am a current Xfinity customer. I have a working Xfinity router with Internet Service and Xfinity Cable TV Services. They are all working fine. I have the Xfinity Stream app for my iPhone working just fine. The Xfinity Stream app works on my laptop. 

Xfinity Stream is not working on my Apple TV. The Apple TV is model 4K / A2169 (32 GB) tvOS 26.3, I downloaded the Xfinity Stream app from the Apple TV Store. 
I sign in either way by the URL and Activation code or with the QR code and get the same results again and again. I have attempted this over several months and get eh same results. With this message:

"Something Went Wrong. We're sorry, something unexpected happened. Please try again."

Help please.