admin1 invites a user with an email invitation that has a token in it to "aliasOfperson@gmail.com". The person clicks on the token, and already has a users on the app, under their non-aliased email. It's easy to have a hanging pending invite for admin1 to see. (I've run into a lot of places where the act of inviting someone creates an account that can only be authed to from the invite token, or something similar)