Just wasted several hours trying to find out why home sharing stopped working on my Apple TV. I’ve got the one with optical audio output, can’t remember if that is called the gen 2 or 3, but you know which one I mean.
Duck-ducked it thoroughly, finding a truckload of similar complaints over the last two years, which in itself wasn’t too encouraging. Most recommended logging out and in from home sharing, changing the computer name in system settings, and so on. Nothing helped.
Finally I changed the wireless from my very current tower Airport Extreme to a slightly older, flat square, Airport Extreme, and lo, all the misery resolved itself. Which reminded me that the Extreme did an update maybe two days ago.
I’m getting increasingly bad vibes about Apple quality, or lack thereof.