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“An unexpected error occurred. Please try again”
"If you see this error, uninstall the Sonos app by opening the app and clicking Sonos > Uninstall. Then, download and reinstall the Sonos app."
 - THE SAME AS I DID LAST TIME, AND THE TIME BEFORE.
When are they going to make Sonos work properly on Mac!! 

Have you read this thread?
 

 

Particularly the “answer”, which resolved this issue for me on my several Macs.