This happens all the time when companies change their name and email domain, and is very easy to do on platforms like Zoom, where they give us a .CSV with our current list of Managed Users that we update with new emails for the Managed Users.

When changing emails for Managed Users in bulk, give us the option to submit an Excel list with old emails and new emails to Support, and have support handle everything on the backend so that those users can now login with the new emails.