I'm implementing authentication for a mobile application. The sign in fields are username, email, and password. After a user has made an account with one email, they can come back and make another account with the same email but different username and password. Is there a simple work around solution to return an error for this scenario? It seems like a common problem but I cant seem to find an easy solution.
Only "easy" solution for now is to switch to login with email.
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