When checking the Event History related list of an Event, some approval steps are missing.
The users involved in the Approval did not use the Veeva application online or offline. Instead Salesforce standard pages, a home page widget or Salesforce for iOS/Android applications are used.
Events Management approval processes should be done and handled from the Veeva application (Either Online or from iRep/Winmodern).
Salesforce for iOS/Android, a Home Page Approval Widget and Salesforce standard pages are not supported for Approval Processes with Events Management.
CRM Help Documentation: CRM Guide
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