I added locast for Detroit into my DVR config. The channels show up fine on the DVR web config page. The locast channel for WXYZ .. locast channel 5921 does not show up on the AppleTV guide page. I have deleted and reinstalled the channels app from the appletv and that does not fix the problem.
Are you looking at the guide or settings? Channels are often consolidated in the guide, but in the settings you should be able to see it I would think.
Locast channel 5921 shows up in the DVR settings and guide via the DVR web interface just fine.
Locast channel 5921 shows up on the appletv in the settings area for manage sources.
Locast channel 5921 does not show up on the appletv main menu guide at all.
Do you have other sources of the same network? The clients will merge channels with the same lineups and only show one of them if there are multiples sources.