Changing the email on a contact gives an error that the email aready exists on another (del) contact

A user subscribed with an incorrect @yahoo.con email, but had another @yahoo.com entry with "no permission" set.

I deleted the "no permission" entry, but now I cannot correct the other contact to have the correct email????

Geeting error msg: "This email address already exists in your account."

Yes, but it was deleted - but apparently still there?

How can one fix this?