Which MacOS is your Mac Mini running? Have you read this thread?

In S2, Sonos has changed the way that their new app accesses audio from shared libraries on the local network. The previous S2 App supported SMBv1 and HTTP protocols for file sharing, but these have known vulnerabilities and are no longer used by Microsoft, Google, Apple, Amazon etc. and all these companies, including Sonos, have now shifted to using SMBv2 (or higher) file sharing.  You may need to upgrade your shares. Are you running Sonos S2? Or S1?

Sonos sent out notices both in the S2 app, and in email, about these changes. They also updated the FAQ to reflect the update. While they have stated that the local library system continues to be worked on, I do not expect them to resume use of HTTP or SMB v1, so if your computer uses them, I’d recommend re-adding your share, as is indicated in the controller, where it says ‘We’ve made security changes to supported libraries. You may need to re-add your library”.

If you’re having trouble finding this area in your controller, open the S2 controller, click on the gear icon at the upper right of the screen, then the word ‘Manage’ under it. Next, click on ‘Music Library’, and the page to enter/modify your local library will come up.

If you continue to have issues, I would recommend that you call Sonos Support to discuss it.

I have a Sonos1 and Bridge on a 12.4.7 mac Mini.

No such thing as a Sonos 1, is it a Sonos One or a Play 1, the difference can matter.

The Bridge can bring a host of problems, unplug it and temporarily connect your One/Play 1 to the Ethernet that went to the Bridge and see if things work then.

The bridge works and the speaker works. I can play Sonos Radio and similar. It just refuses to recognize the music folder no matter where it is. Is there a special music protocol like mpg, flac, or similar that helps?