The Stream app doesn't work on an Xbox.
This is pathetic comcast. No wonder you are losing all your subscribers. I can stream netflix, amazon, hulu, everything else, but I can't stream my own DVR from another room to my xbox. Is this just so that you can make another $10 / month on your lame boxes?
I too was just lied to by a rep who told me I could stream from my xbox1
it it hooks up (in the end) to a TV then you need a set top box (or if you have other set top boxes, a Roku). exception is using a TV as a monitor from a desk/laptop as that function is grandfathered "in".
While you can't stream directly, you can use the multiple apps that are on the xbox one. For example ESPN, CBS Sports, NBC Sports, Disney Channel, etc..