I am facing the same issue but I am using the swift package manager instead of Pod. How I will resolve this issue.
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Append +01 (example+01@gmail) if you see the same error "A user with this email address already exists on the team" to your email address. I found that when entering the password for sandbox account it must contains a capital letter, number and punctuation mark other wise it will give an error and does not locate the error posting. So please change your password to this formate as well.