Appointments+: Issues with vendor Google Sync

Hi, I would love some help getting my vendor google sync to work.

Currently, user bookings via the front end generate an appointment in the vendors google calendar, but appointments manually entered into the vendors google cal do not affect the availability showing for that vendor on the front end.

I have twice setup the google sync for the admin and vendor, then processed test entries from both ends and the outcome is the same. On both occasions I have left the entires in place for at 6 hours

Help!

Thank you
Nic