I'm having the same issue. Just replaced my router (for other reasons, it crapped out and wouldn't power on, less than a year old btw) and there's no change to the problem.
My Apple TV (which isn't on) shows up; my Chromecast (kind of always on in sleep mode I think) shows up; and my laptop (on) shows up. My iPhone, which has the app on it, doesn't show up.
Sounds like this has been a problem for at least six months based on this thread. Any resolution yet, Comcast?
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