Video Tutorial Domain Registration

I am trying to register my domain for the video tutorials on this site. I think it was previously registered with another WPMUDev account that no longer exists. When I try to register with my support@jmgsystems.com wpmu dev account, it tells me that the domain has already been registered and that I need to contact support. I've tried uninstalling and re-installing the plugin.

Any help is greatly appreciated.

Thanks!