You may face the following issue when trying to execute the Load method for the Exchange Online Appointment SmartObject.
Service: Exchange Online Service Guid: [GUID] Severity: Error Error Message: Access is denied. Check credentials and try again., The process failed to get the correct properties. InnerException Message:
This is expected behavior. You need to provide Read and Manage permissions to the account who needs to load the Appointment on the User's mailbox who created the Appointment.
When executing the Update method of the Exchange Online Appintment SmartObject, it can only be updated by meeting organizer.