I get this error: "Challenge not yet complete. We can't find an inactive user with 'guestadmin' in the Username and guestadm as the Alias. Make sure that the user is NOT active. " When creating the new user it won't allow me to use "guestadmin" as the Username due to this error message: "Error: Username must be in the form of an email address (for example, john@acme.com)". What should I do to complete the challenge?
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