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If two users share an email address, and we use email addresses as usernames - can both users have their shared email as their username?
Users that share an email address can both have the email address on file in their Primary or CC email fields - but both users cannot use the email address as their username. No user in the system can have the same username as another user in the system.
You would either need to give one of the users a unique username, or have one user provide a different email address, which could be used as their username.