Answered
How does Sonos Streaming Work
Can I reset Sono's system to out of box settings to get rid of an old Apple Music login that is no longer accessible?
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You can, but it would require a factory reset on every unit, and that’s a long way to go to just get rid of a login. You should just remove the service instead. See this link:
https://support.sonos.com/en-us/article/remove-a-content-service-account-from-sonos
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