Hi, @rsoule, and welcome to the Netlify community site. 
The issue was likely the same one being discussed in the community topic here. Quoting:
Generally, the reason we are unable to provide a complete SSL certificate for your custom domain is that the DNS (Domain Name System) cache timeout or TTL(Time To Live) for a record had not had time to expire (from your old settings) before you tried to use it with Netlify.
I clicked the “Renew certificate” button found at “Site Name” > Settings > Domain management > HTTPS and this appears to have resolved the issue.
If there are other questions or concerns, please let us know.