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 (no.no.no.no) 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 no.no.no.no 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 no.no.no.no." Fix it here»

What should I do?