"ready to cast" does not cast xfinity to chromecast

Xfinity stream is not casting to chromecast. it is connecting because it say "xfinity stream ready to cast" and the app says that it is casting to "living room" but the show does not cast.  it just runs the 3 dots like it is trying to cast but it doesn't. When I click the cast icon, it says that it is casting but also says "Media not selected". so, I click done & the app just does not cast... the TV cast saying "xfinity stream ready to cast" times out and goes back to google... and the app times out.  

I did some trouble shooting that got to a place that confirms the Chromecast and app all had strong wifi... 

Every other app is casting to the Chromecast except xfinity. Netflix, Youtube, HBOMax, Prime.... everything but xfinity is casting. please advise.