After the recent upgrade of my home server to Ubuntu 20.04, Sonos was again having trouble accessing the SMB shared folder for my music library. Turns out that the newer version of Samba in Ubuntu 20.04 turns off SMBv1 by default. Simply adding server min protocol = NT1 to /etc/samba/smb.conf and systemctl restart smbd fixed the problem.
Sonos and Ubuntu 20.04 Samba
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Thanks. That was it.