Hi Folks, I'm with the same issue. Everything was working fine, and yesterday (11/14/19) all my Samsung TVs started showing this TVAPP-00100 error. I've performed several steps with no luck so far:
- Restart both the modem and TVs
- Signed out of the app and then deleted the Xfinity Stream Beta app from one TV and install it again: it is now even worse - I don't recommend doing it. The app hangs in the first screen.
- Reset the Xfi modem to factory settings
I opened a ticket with Comcast and it was escalated to Tier 2. Let's see how it goes.