Home Sharing no longer works if your OS versions don't match (per Apple Support)

Interesting, thanks for the info.

I have had a number of issues with home sharing over the years. Right now, I am wrestling with DRM issues on protected AAC files. Play fine on AppleTVs using home sharing, but not iPad or iPhone. I wonder if your issue might affect that? I have been focused on the DRM problem.

I have an intel-Mac running macOS and a M1-Mac running a different OS. I am using my older intel-Mac as a media server, and have Home Sharing turned on.

That is supposed to work, afaik. And does work for me with different macOS versions (both Intel, though).

I cannot stream to my M1-Mac unless I allow "guest users" (per Apple Support).

I’m not convinced yet, until there is a support document saying that.

This saddens me, but I thought I should let the community know. I was, to say it politely, disappointment with the Apple Support response that by upgrading I had broken Home Sharing functionality (they actually stated that the different macOS versions was the cause of the issue; if your macOS versions don't match then you cannot share media)

Thanks for sharing anyway.