No Xbox One Xfinity Stream App?

Is the Xfinity Stream App available for Xbox One? If not, then when will it be? It's kind of weird that a massive mainstream company like Comcast would not have an app for something like Xbox One. Additionally, when I tried to view content by individual channels that are offered with our Comcast service on Xbox One, Starz, which has an app on Xbox One, doesn't even list Comcast as a provider for me to be able to prove that I have Starz, so that I can watch the content I'm paying for. (Ironically, a mere channel like Starz has an app on Xbox One, but not an entire cable company like Comcast?) This is all a big let down to be honest and kind of rediculous. I even tried to just simply look up Comcast through the internet browser available on Xbox One and stream my service that way; I could not do that either. It's like, no matter what, Comcast boxes you out of being able to view the content you're paying for. Is it because Comcast is luddite or is there some kind of corporate dispute between Microsoft and Comcast?