Sideloading APK on Google TV

I am trying to sideload the Xfinity Stream apk to my google TV and it almost is working. Whenever i log in i go through all the steps of verifying with my phone number then I go to click the account I want to access and after hitting continue I am met with a "Web Page not available" error message. I have looked around to try and find options but no luck so far. Before going further yes I am aware that I can just cast xfinity stream from my phone but I would really like it to work this way if possible. I have a browser on my tv that I am working through and I have tried multiple other browsers with no luck. Any help is appreciated.