Google Apps Calendar sync with Appointments +

I recently got Appointments + set up on my website and was going through the process of syncing a Service Provider Google Apps calendar and cannot get it to work.

I realized it was a permission issue on the Google Apps calendar as it would not grant the service calendar email permission to "make changes to" the calendar. The only option available is to "see all events and details".

There will be more service providers added with Google apps calendars and they will need to have their calendars synced to the plugin to see their appointments. Please advise what to do.