Anti-Splog Plugin

Hi. I am experiencing some error with the Anti-Splog Plugin.

In the Settings Page, it says

You must enter an API key and register the IP ( and WPMU Site Domain (domain.tld) of this server to enable live splog checking. Get your API key and register your server here. You must be a current WPMU DEV Premium subscriber to access our API.

So I follow the link and register the IP as and domain as domain.tld and I come back, refresh the page and enter the API Key.

Then, it gives an error saying

There was a problem with the API key you entered: "Your server IP and WPMU Site Domain is not yet registered for this API Key. You are attempting to connect from" Fix it here»

What should I do?