For some reason, after the 2017.08.6.1637 update, I had to subscribe, setup storage, and setup guide data. Now, when I access my ATV Channels app, it shows no scheduled recordings and no passes.
I am using the same hard drive on my mac mini, and the same folder setup as before. All this just happened within the last 15 minutes, and in the middle of watching a recorded tv show.
Mark