Your organization has multiple sites and Ann is a user. The domain of Ann's email address is not verified. What is possibly true about Ann's account?

If Ann’s email domain is not verified by your organization, it means that you do not own or manage

her account. However, she may have a managed account in another organization that has verified

her domain. In that case, you cannot enforce security policies, deactivate, or delete her account12.

Reference:

Verify a domain to manage accounts

Solved: Verify domain - Missing accounts