I get FOX, ABC, NBC and it seems like everything else, just no CBS. I had it the other day on mu QNAP NAS, but when I moved to a Win 10 setup, it disappeared.
Log into Live Stream TV Shows, Sports and News on CBS and see if you can access your local CBS affiliate. If you can’t, there’s no magic that Channels can do to help. But I share your pain — I can’t get CBS either.
I think it's a problem with CBS.
Half the time when I login to their live website, Xfinity says I don't have CBS in my lineup.
Sometimes I get in and it shows the wrong local station.
Other times I get in and the video stream doesn't start (just a buffering, spinning circle).
It’s just strange, I’ve had CBS for several months now on my QNAP NAS, but when I changed to Windows, no cigar. Strange!!
My local Fox authentication seems to vary every week or so. In general, it seems to be a mismatch between authentication systems, and comes and goes. There isn't a real rhyme or reason.
The short answer is if you need your locals, use an OTA tuner with an antenna. The long answer is "it's complicated", and you won't ever get a full explanation or a satisfactory answer, because solely-internet based local feeds are fragile, and likely to break.
I do have two antennas and amps in my attic that let me get iffy coverage, but distance and topography are against me. Some days it’s great and others some channels are unwatchable