AdminCP Access

I am trying to add a new user as an administrator. I've edited my config.php file to add his user ID number to the appropriate places. Double checked his number is in Super Admins. In his user manager I checked the box Administrator.

When he logs in he sees the Admin button and Mod button at the bottom of his screen. When he clicks the admin button he gets the following message:

Your IP address (xx.xxx.xxx.xx) is currently awaiting authorization to be enabled for the user steveb. Please...

AdminCP Access