1st Method: Click on Schedule > Click on the cancelled appointment > Click on "Restore the appointment".
The student will automatically be credited again.
2nd Method: Search for the student in the search bar > Click on the tab "Appointments" of its account > Click on the arrow icon to restore the appointment.
The appointment is restored and the pass is credited again.
⚠️ Pay attention : it is not possible to restore an appointment which has been removed because the suppression is an irreversible action that erases every information in the historical.