Check the saved assignment
Open the assistant’s Calendars picker and let it load. Confirm the selected calendar belongs to the intended account. An assistant has one active calendar; selecting a different one replaces it. Clicking the selected calendar removes it. If a GHL calendar is missing, run the account’s connection check. If the calendar exists but the picker cannot load the assignment, resolve that error before changing it.Compare each booking step
The booking operation checks current availability before creating a GHL appointment. An availability result from an earlier moment does not reserve that slot.