I know people have run into this one b/c I've found a bunch online about it but no solutions, and the Apple advisors are stumped it seems.
I have a new computer that I bought a few months ago, and the old one is across the room, both on the same network. On both my old computer and this new one, home sharing used to work perfectly fine. I'm signed into my apple account on both the Apple TV and both computers. The orange computer app on the Apple TV finds my library (the library that's on my new computer w/ songs that are all on an external drive hooked to that computer), but when I try to play something, it just does the wheel spin forever. When I add an album to my library, it does show on the Apple TV app, but it still won't play. It used to play everything up until what *I think* was some sort of update, either on the eero or computer, I can't remember.
But my thought is that it has something to do w/ my old computer still being on the same network - except it still doesn't work when the old computer is shut down. Plus I've turned off file sharing on my old one. So it's pointed at the right computer and finding everything there, just not actually playing when click on something.