Xfinity Stream no longer works on Apple TV device?

I got an Xfinity broadband Internet and streaming package last spring. It was supposed to include Xfinity Stream with live TV channels, Apple TV+, Netflix, and Peacock.

I purchased a new Apple TV 4K Wi‑Fi + Ethernet with 128GB storage streaming device from the Apple Store and initiated it on the Xfinity network.

Everything worked fine for a couple of months, but in approximately August, Xfinity Stream stopped working on my TV via the Apple TV device. (The Xfinity Stream app will work on my iPhone or MacBook.) I've deleted and reinstalled the app on Apple TV, rebooted the Xfinity modem, and attempted to log into the Xfinity Stream on Apple TV numerous times, but get this each time:

It appears that Xfinity Stream is no longer compatible with Apple TV? Perhaps a contract dispute?