Mapped Subdomain Front End Customize 403

Ok, I am spinning my tires. Everything has been setup for a subdomain multisite and a new domain was mapped. The only place I am finding an issue is when the admin attempts to use the customize editor on the front end. Hostgator keeps returning a 403 forbidden. Any help would be greatly appreciated. The user is not very savvy and depends on the customize feature for edits.

Primary Domain: http://crossculture.io/
Original Subdomain: http://jpcollective.crossculture.io/
Mapped Subdomain: http://jpcollective.church/

Thanks!