Many years ago I worked for a Newspaper Holding Company as the PC support specialist. They had a whole group of people doing Apple support for the newspapers and I spent some time comparing notes with them. The one thing I came away with was the saying “With Apple it’s either easy to do something or impossible”. The only Apple product I use is an iPhone 13 issued by my employer. I don’t own anything Apple.
Mark Gosdin
I use a MacBook with a random HP all-in-one device. Every so often the drivers will be updated and the Mac will stop dead cold. No printing for you! Reinstall! The HP will continue to work smoothly with an iPhone or iPad, but not MacOS. After a month or three MacOS will receive new drivers and it’ll work again.
Our PCs never miss a beat.
Weird. I use a MacBook Pro with a random HP all-in-one device and never installed a driver. I just put the printer on the wifi and it showed up in my printer list. Never had an issue with printing to it. 
My experience with my HP all in one echoes yours. ROON is a different animal.
FIXED - the latest update of MacOS 18.1 Sequoia fixed the issue. All zones showing now.
The above post brought to you from three years in to the future.
OOPS, 15.1 although I was concerned that it might be 3 years…
And now that Sequoia 15.2 is here, all the Zone problems are back. No network zones. No Sonos. No PC, No ipads, no iphones.
No endpoints except what’s connected to the MacBook Pro.
Rebooting the router doesn’t help. Toggling the Local Network permission doesn’t help. Running wifi only and toggling wifi doesn’t help. Ditto USB ethernet only and toggling, or both.
Turning Tailscale on or off doesn’t help. Not using Private relay - wasn’t that a few OS’s ago?
Added the above to the ROON support. It’s a Mac issue. Makes me want to get a dedicated ROON server, Noookleus or something.
NOTE A DAY LATER - Looking at the Roon Nucleus and restarting the Mac helped. I see the zones again.
Roon is an amazing program. When it works. Why doesn’t it recognize USB devices consistently? Drives me nuts.