Sharing permissions via the Outlook client no longer works now that Purdue has gone to Office365. One MUST configure sharing permissions in the web client, outlook.office.com. Because there may be existing legacy calendar permissions, it is recommended to remove all calendar permissions in the Outlook client first, then recreate them through the web client, outlook.office.com. One may want to take note of the permissions before deleting them from Outlook client as a way to remember who had what permissions when creating them in the web client.
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