Doesn’t sync Google Calendar and Pinpoint

I have done the installation correctly and the Google Calendar data passes to PinPoint but not the other way around.

When a reservation is made on PinPoint it is not included in Google Calendar or in the PinPoint calendar itself. If I disable Google Calendar sync, new bookings appear in the PinPoint calendar, if I update it, they don’t.

Obviously in Google Calendar the PinPoint reservations do not appear, if those that already existed before other systems.

In addition, with Google Calendar synchronization active, it generates a critical error when finishing the payment.