In Control Panel -> User Details I have registered 3 users in addition to the primary account.

All of them can receive and send mails.

However I'm trying to create a user asesorias@meta7.com.mx and I get an error message: "The user is already invited".

If I go to the Invitation list the user has a "Pending" status.

Why this user was invited instead of created?

I don't have a way to use that email. For that reason I can't accept the "invitation".

Please check my 2 attached images for better understand.