After a lot of aggro I finally shared my music library, after installing a BT Mesh on a Windows 11 PC.

I was getting the 913 and 1002 errors, which I didn’t get when setting SONOS up directly to my router (no mesh).  Hope this helps someone, as I couldn’t find a fix on here that helped me.

1. File Explorer, right click on the music folder (mine is Jally Music)
2. click on “Show More Options”
3. click “Give Access To”
4. select “Specific People”
5. Type Sonos and hit return (it adds ‘Sonos Wireless Hifi System’ to the access list)
6. Click the Share button to end the process
7. Return to the Sonos app and add your music library again

Good luck.