I am an admin for my company's Canvas instance. We have used SIS import to add students to the LMS. All courses we have offered to this point have been recruiting cohorts and manually adding the students to the faciliated course. However, we now are ready to release self-paced courses and would like those to be self-enroll. We have published an enrollment link for folks and have found that when folks go to "enroll" the system tells them their email address is already in use (due to the SIS import). I have not been able to figure out a way around this, is there a way we can open up self-enrollment in Canvas?