Cant stream network tv; other streaming fine

On PC not using Apps. I manged to contact Xfinity once again ans was told (and now i understand clearly) there is an ongoing issue with Xfinity streaming not working for many people. That is the issue. They're still "working" on it. I've now figured out that all the networks don't stream the video themselves but just stream through the provider, thus the streaming always fails because Xfinity's streaming service has some kind of major issue they seem unable to resolve now for 2 months or so
 

@user_phl8gz Yes, this is correct. We're working on resolving any known issues with the Streaming app. We can definitely troubleshoot this as well. Have you tried using a different device? If so, are you experiencing the same issue as your PC when you use another device?

I only watch on my PC. If that doesn't work, can't watch. Still happening as of 1/8

Thanks for those additional details, user_phl8gz. Are you using the Xfinity Stream app in order to stream those channels, or how are you attempting to stream?

It's right in the original post!!!! IF I GO TO ANY NETWORK THAT HAS TV SHOWS, THEY ASK ME TO SIGN IN USING XFINITY. THEN IT WILL NOT STREAM; IT FAILS. If any site STREAMS THE FEATURE ITSELF, IT WORKS FINE. Only if I have to sign in with Xfinith does it fail.