I can log in to sonos.com correct, But in the app it is some other user I dont know. I above is not correct.
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https://support.sonos.com/s/article/4922?language=en_US
However, if you are trying to add a pre-owned speaker, reset that speaker and try adding it again.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.