AMP for Custom Post Type Not Working

Ref Support UUID: ampwp-a47eb60b-c9c5-5254-9524-9b912e2ee07c

We are running in transitional mode and have posts and a custom post type advisor_post set as the content types and single posts as the templates. Posts work fine. However with advisor posts, if I add amp or ?amp=1 to the url, the post reverts to the normal version. If I set Redirect mobile visitors to AMP, then I just get a blank screen when viewed on mobile.