Hi @jenkinskel thanks for posting on the forum and welcome to the SimScale Community 
It’s a bit hard to pinpoint what the problem exactly is without having a closer look at the CAD model - could share your project’s URL? Here’s how to do that: Guide to Clear and Understandable Forum Posting
However, one simple troubleshoot you could do is trying to export the model as another format, maybe ACIS or preferrably STEP/Parasolid.
Cheers
Igor