If you visit

If you visit http://mybloggingsite.com/clients/cart.php?a=add&pid=10
and select to Use a subdomain from My Blogging Site. Enter "mlfiles" as the chosen sub domain or "support" because i know they both already exist and should come back as being not available but it actually fails and appears they are available. It isn't untill the order is processed that the order will actually fail as they already exisit within wordpress.