Message on tv screen says this channel is "included in your subscription." I assume that means at no additional cost. Says "go to infinity.com and my account". Nowhere can I find how to add the channels that I am supposed to get.
That message is completely incorrect. Whether the channel is part of your subscription but not working correctly, or the channel is NOT part of your subscription, if you want to watch it you need to contact one of their reps at the phone number on your bill or 1-800-Comcast, or chat with them using one of the options at https://www.comcastsupport.com/chatentry/. You can't do anything about it in "My Account".