My prepaid Xfinity stream app

I woke up to watch my basic tv channels I have the prepaid services which I purchased the Roku to have the Xfinity stream beta app but it's not sighing me in and I tried to redo it all by going to the Xfinity authorize site and put in the code my app gave me but says I am successfully logged in but I need to be an Xfinity customer to use the app can someone please help me what can I do to watch my channel I paid for. I also can't log in on any of my other devices!!!!!