RMS invite new user error

NETWORKING SOLUTIONS
1

I want to invite a new user in RMS. I did successfuly for 2 different emails, but suddenly with a third email address I get this error below the email field

The email has already been taken.

But the email is not on the list of users. I had invited a similar email (one letter was wrong) and already deleted the invitation. May that be the reason? How to fix this now?

2

Hello,

The user you are trying to invite most likely already has an RMS account. In that case, they might need to use a different email for an RMS account with a role in your company.
Alternatively, you can contact your sales manager and they will arrange for the old account to be deleted.

Best regards,