Hi Nikola After dozen hours trying to understand, now I’m sure : Google back sync automatically cancel an appointment in EA, whereas it has been received « confirmed » few minutes before from EA, and it's not because of the #linkcancel# First, you have to know that the Google back sync works every 5 to 20mn so it’s very difficult to test and check if each solution works. (even if my cron job is every 1mn, and sync interval data is 5mn in EA) Now, for each test, what I made : - I created an appointment A on the website, - I checked if it’s well-confirmed in EA back office - I create an appointment B in GCal - I waited to see B in EA back office to be sure that Google sync back is ok, and I checked the status of A. At the beginning , I let “Delete from GCal will :” with the value “delete appointment in EA” so I didn’t realize that all my appoinments disappeared in EA, because they stayed in GCal… Honestly, I made so much tests so I didn’t see the problem immediately… Finally, after 2 or 3 re-install, let “Delete from GCal will :” with the value “cancel appointment in EA” and at this time I could see the changed status confirmed > cancelled after Google back sync. Here https://easy-appointments.net/support/appointment-created-in-gc-are-correctly-recorded-in-ea-back-office-but-still-available-on-front-office/ , I thought it was because of my old version, I updated… I was sure it was ok because I didn’t wait for a new Google back sync… But actually it didn’t work. Then I thought it was because of the #linkcancel# into emails, subjects, ICS… I deleted it but no… Then, I deleted ICS for everyone but no… Finally I disabled all emails (for notifications, worker, admin, customer), but no… I search for the same bugs and It seems I’m not alone : https://easy-appointments.net/support/appointment-time-slots-still-available-after-bookin/ https://easy-appointments.net/support/appointments-switch-to-cancelled/ What could you suggest me now ?