My initial guess is that the manufacturer of your NAS pushed out an update that messed with your settings. Since you didn’t tell us which Sonos OS you’re using, I’ll just point you to some extra data:
For MacOS users, see this thread.
It is likely you’ll need to adjust the settings that got changed, and somewhat possible you’ll need to reset up the library in Sonos itself.
Thanks, appreciate the feedback, but still no-go.
It would seem that since I’m not getting an Error 913 but rather: “...check the username and/or password” that the folder is set up correctly but for some reason my credentials are not recognized.
I guess I’ll try customer support. I did recently update to Mac 15.3.2 before losing my library. Who knows?
A quick followup to my above post…
My music library has been restored after a 2 ½ hour phone session with Sonos support. Both reps who helped me were professional, competent, patient. So, sort of a good word for Sonos.
But, IMO it shows how screwed up the system is if took such resources to resolve what should be (in my non-technical mind) a simple issue.