Comcast / Xfinity Stream ERROR - Update your browser to start streaming

This does not work for everyone and I can’t figure out why. This is killing me because I refuse to install another browser just to stream. I’ve tried adding this, even tried different varitions including extra pound signs www. /stream, nothing works!!! I even downgraded to the previous stable version and that didnt help. I also just enabled that extra filter group with no luck. Also just changed the only 2 settings agressive and strict from the helpful Info to no avail.