Xfinity Authentication - Apps?

Basically, you can use the companion app for any channel that you have on your Xfinity cable package. There are dozens of tv apps, so it's best that you just look for apps for the channels you watch/like the most. You log in using your Xfinity username and password, so you cannot get into the apps for channels to which you're not subscribed.

Unfortunately, Xfinity does not support single sign-on, so you have to sign in app by app.

 

In my experience, most tv apps don't work with xfinity. HBO and Showtime work, but the basic cable apps like HGTV and the History channel, et al, don't work with xfinity.
Hope this changes in the future.

 

I have no issues using the History Channel with my Xfinity Comcast account, it does need external verification from a PC, however I had issues when trying to use History channel from a Spectrum account, History channel back then didn't support Spectrum as a provider.