Multi-Domains: Login Redirect When Attempting to Create New Site

Hello,

I've got a multi-site install over at carnaval.bz

Trying to use the multi-domain plugin so that we can also create sites at carnivalcities.org

Installed the plugin, added carnivalcities.org and set the A record at carnivalcities.org to point to the IP address of carnaval.bz

When I go to create a site carnivalcities.org/test from the network admin dashboard over at carnaval.bz, it just redirects me to carnivalcities.org, and no site is created.

Advice? Thanks!