WPMU Domain Mapping plugin error

Our WPMU mapping plugin is giving us an error. WP Engine took a look at it and said it was the plugin. Here's a screenshot:


We are trying to map http://tjraleigh.com to http://basic.snapsites.co/raleigh

We've successfully mapped 20-30 other domains to various other multisite installs using the domain mapping plugin but this one isn’t working for some reason. We've quintuple-checked all settings (i.e. correct A record in Name.com, set up domain in the WP Engine portal correctly, and even tried creating a redirect rule in WP Engine’s dashboard as a last result but no dice). The domain mapping plugin still can’t resolve the domain for some reason.

We enabled WPMU back-end access. Feel free to let us know if you have any issues.