Cannot select days on calendar, using WP Client

I am having an issue with the plugin. When the calendar is behind a secure page using WP Client, the calendar does not work.

Using the calendar on a public page works just fine.

Public: http://xenonhealth.staging.wpengine.com/make-an-appointment/

Private: http://xenonhealth.staging.wpengine.com/portal/portal-page/calendar/
User: test-client
PW: welcome

Not sure how to resolve this. The only difference I see in the console is admin-ajax.php fires in the XHR when clicking a time. I cant even get the confirmation to show up on the protected page. Help!

https://wordpress.org/plugins/appointments/