How do I un-blacklist an email domain?

Hi! We have a user who has an email address which, despite looking overwhelmingly like a fake email address, is actually correct and valid. We automatically create accounts for all of our users, so I can confirm that their account does exist. However, they are unable to log in because their email domain is blacklisted automatically by Auth0, and they cannot receive the email to set their password.

We do not want this email domain to be blacklisted. How do we remove it from the blacklist?