Thanks for writing in - it’s good to see you on the community!
Since you’re running Roon Server on Sequoia, can you please navigate to macOS System Settings > Privacy & Security > Local Network , and make sure Roon is allowed. If it is already enabled, toggle it off and on again. Then reboot your Mac, and see if the same issue persists.
I’d also double-check to make sure all your Roon devices are still on the same subnet within your network. We’ll be on standby for your reply!
Benjamin Thank You for your quick reply. I just did everything you suggested and Sonos speakers (3) still aren’t showing up on Roon. They are working with other apps. Also the problem only happened when Roon update happened today.
I went to Apple Security Privacy then Local Network settings and toggled off/on Roon settings. Now all zones are back! Thank You Frans Ooms from facebook Roon group