Answered
remove speaker
How do I remove a speaker from app my Sonos account?
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From the app? I think you would unplug it, then reboot / power cycle your other Sonos speakers and your router, both of which would ‘remember’ it for a while until flushing it out. Or just wait, too.
From your account on Sonos.com, you’d have someone new register it to their Sonos account (one of the reasons you should factory reset before passing it on, forcing the new user to register it to their own account).
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