Since you’re running macOS, the behavior you’re seeing is consistent with the newer, stricter Local Network permission controls in the recent macOS releases.
Please try the following steps:
Open macOS System Settings → Privacy & Security → Local Network
Make sure Roon and Roon Server are both enabled
Even if they are already enabled, please toggle them off and back on
Fully quit Roon Server from the macOS menu bar / task bar
Reboot your Mac
After reboot, launch Roon again and check if the devices is avaliable again.
Once these permissions are refreshed and the system restarted, your audio devices should reappear.
Please let us know if the issue persists after these steps, and we’ll continue from there.
Wanted to follow up on this. Were you able to check the macOS Local Network permissions for both Roon and Roon Server, toggle them off and back on, then fully quit Roon Server, reboot the Mac, and see if the audio devices came back afterward? If the issue is still there, let us know what you found and we’ll take it from there, thanks.
We have not heard back from you, so we will go ahead and close this thread due to inactivity. If you need further assistance, please submit a new support request and specify that the issue be reopened. Thank you.