Office 365 Can't Modify Calendar After Hybrid Migration

Had an issue this morning where a user could not modify another user's calendar. The user had PublishingAuthor permission to the calendar, both users were on Office 365, I had waited 24 hours after reapplying the permissions. The user could see the full details of the calendar, but she could not modify it. Right clicking on the calendar would only show the greyed out items below.

Right clicking on the calendar permissions would return the error below:

Cannot display the folder properties. The folder may have been deleted or the server where the folder is stored may be unavailable. Cannot display folder properties. You don't have appropriate permissions to perform this action.

I created a whole new profile on a different computer to test. I waited for the cache to finish building but I still had the issue. Ultimately, the solution was to add the calendar from the Online Global Address List, and not the Offline Global Address List.

  1. Clear all of the Office/Outlook related credentials in Credential Manager
    1. This might not be necessary but it makes sure that we are starting fresh
  2. Re create the Outlook profile
    1. I didn't have to do this on the test profile, but I had to do it on the user's computer
  3. Remove the calendar if it shows up
  4. Right Click on "My Calendars" > Add Calendar > From Address Book
  5. On the top make sure to select "Global Address List" and not "Offline Global Address List"
  6. Wait 2-5 minutes for the calendar to sync


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