I assume this is an xfinity issue? I've tried Edge Chromium, Google Chrome, & FF. Cleared Cache mulriple times ro no avail.
are you physically inside usa? using a VPN? changed DNS servers from comcast's ? what opeerating system and version are you using? what browser are you using? have you tried chrome and edge browsers?
Yes, it is an Xfinity side error, although they will deny it. I have been receiving this error for months no matter how I try to stream via the Xfinity website. Doesn't matter if I'm at home connected via wifi or wired or which device I use. Seems like they are trying to push their customers into streaming via the app only. This will never get fixed since it seems intentional.
windows 10 or *nix?
I had Xfinity Stream working on my PC over WiFi.
I turned off the WiFi and used a cable connection to my router.
Even with the same IP address Xfinity Stream would fail with the clear cache error.
After wasting time with a support chat and resetting everything I could think of I just uninstalled Chrome browser including any data and then reinstalled it. Xfinity Stream works again.