Your Users have not received their invites email, but they have and their account works fine

I recently made a new adobe account for a user, she has been using it fine - adding herself into the license pool and taking herself back out when finished.

She keeps receiving these emails however saying that "Your users have not received their invites" 

I have checked her adobe account and her email is verified, everything is in order - why would she keep getting these emails?

Any help appreciated.