Possible to pre-enroll users into MFA

Probably a long shot —
We are going to be using a custom database with a login script to slowly move our user base into Auth0.
Is there any way we can pre-enroll existing users in MFA so that they don’t have to do it during their first login?
We’re thinking an email campaign asking them to go enroll. However, I notice to enroll you have to have a user_id, which they won’t have yet, and we can’t create them ahead of time because we don’t have their passwords.