# Error 1104

This error indicates that the email address you are trying to add is already taken in the system.

### Common cause

This error can occur if an email has been added with some variation of the email you're trying to add. For example, `my+user@example.com` and `my.user@example.com` will be treated the same in our system.

### Resolution

Log in as the old user and change email to a "throwaway" address, which will free up the new email.