Replied on two what I thought were related topics. Got some flac so here is a new topic.
Why is Sonos asking me to sign in when I have already done so.
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My suggestion to perhaps try is, to first sign-in & sign-out of the App, just to ensure that you’ve signed out the account.
Then uninstall the App and reinstall it, accept the T&C’s etc. Connect back to the ‘existing’ System and then sign in again and see if that might resolve the issue.