Domain is not available to purchase through Domain Mapping Plugin

I've added Domain Mapping through to my multisite and when I go to purchase a domain on my subsite I get an error saying domain is not available for purchase. I'm using random character domains that I know are available.

I've got a dedicated ip pointing to my multi-site.
I've checked with enom and they've whitelisted it.
I've got the sunrise.php folder set where it should be.
I've edited the wp-config file like the directions said.
I've turned "Verify domain's DNS settings" to no.

I'm at a loss now as to what to do. Any help is appreciated!