Although I’m a SuperAdmin, my knowledge and experience is not very “super,” as I’m just filling in between tech consultants for our small nonprofit.
If by “wp_users table” you mean this page:
https://forums.vermontaccess.net/wp-admin/users.php?orderby=email&order=asc
then, I can tell you that there is no other email among our 61 subscribers that begins with “coordinator@…”
Is there another table somewhere that I have to delete before I can create a New User with that same email address?