We have a particular user here who has an issue with O365 Calendars that she is a Delegate for (Editor permissions)
When attempting to modify existing recurring appointments in the calendar, she gets the error 'Operation Failed' and the appointment is not modified.
This happens with all calendars she has Editor permissions to. The error occurs irrespective of the amount of recurrences.
It happens in both Outlook 2010 and in OWA. Both the user and the owner of the calendar have accounts that are federated to our AD domain.
Has anyone had similar issues and could point us in the right direction? We have tried removing and re-applying the permissions which did not help.
