Error: Duplicate Username. The username already exists in this or another Salesforce organization. Usernames must be unique across all Salesforce organizations. To resolve, use a different username (it doesn't need to match the user's email address).
I have looked through all of my playgrounds and this username GUESTADM@yahoo.com will not let me correct the username to GUESTADMIN@yahoo.com. It keeps giving me the above error message. It will not allow me to save it or correct the mistake I have made to pass this challenge. Any help would be great.
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