Thanks! Done 
Maybe your VPN is causing problems
I tried it with vpn disconnected and connected. Neither worked. 
I tried logging in with DirecTV login and it worked. But then Comcast still didn't work. So it feels like it must be something with them.
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Yes. The problem is that when the DVR clicks this in a Chrome incognito window, no login form is shown for it to be able to enter the user/pass. It logs in automatically to some account which doesn't have a cable tv subscription
I see. I wonder if maybe there is a saved password or browser session somewhere allowing it to do that.
There's no saved anything in chrome incognito
Ok, I think we figured it out. Your last message made me think a bit, like if it is incognito, why is it auto logging in with different credentials...Everytime the window opened to add the source, it would put a username and password in there automatically. EVEN after I deleted all cache, cookies, and passwords from my browser. So on a hunch, I just uninstalled the DVR server, reinstalled and loaded a backup from before all this, and now it works to add xfinity.
When I get that error, usually step 9 (which clears the chromedata folder) fixes it for me.
I do this before rescanning individual channels and before remove/re-add source.
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