Xfinity stream not working on MacBook air

I recently tried to stream live TV from Xfinity Stream on my MacBookAir. I never get past the web site loading, not even to present my credentials. I tried clearing the cache and 3 different browsers (Safari, Chrome and Firefox). I also tried the web portal from my iPad, same behavior. I am running all the latest OS's and Safari is version 16.

Comcast thinks it might be my devices. Anyone else having issues?

thanks