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I had the same issue, reached out to Sonos helpdesk. Very helpful, they used remote access to fix it. Apparently my PC windows 10 was running SMB 1 security which has to be disabled and SMB 2 installed….. plus file sharing permissions had to be changed.
i tried to follow the process but it was beyond me!! However it allowed the new app to access my iTunes music library!! Hope that gives some help……