Appointments+ doesn't post appointments to GCal even after successful connection

We have installed Appointments+ on our test site, and have successfully linked a Google Calendar to the plugin, however we cannot get the appointments made via the website OR admin to show up on the Google Calendar.

Currently the only thing that will show up in the Google Calendar is the "Test Connection" option at the bottom of the GCal settings.

Please let us know what can be done to fix this so that we can have appointments correctly showing up in the GCalendar after they are made via our site.

Current site being used for testing: