Sometimes when a user is unassigned from the application that SCIM configured. Okta not sending the user’s email address which normally sends it through.
Could you take a look at the OKTA system logs for any email-related events for this user? Let’s see if there were any problems with their username, domain, or email service provider.
We need to check if the email got stuck midway or if it never got sent in the first place.
it might be a good idea to open a support case with Okta Support team for some more hands-on assistance with the email events.