HTTP 500 error when a user tries to publish the calendar of a shared mailbox in Microsoft 365

Original KB number:   2934901

Symptoms

When a user who has Full Access permission to a shared mailbox in Microsoft 365 tries to publish the calendar of the shared mailbox, the user receives an HTTP 500 error message.

Cause

This issue occurs if the user isn't the mailbox owner. Only mailbox owners can publish a calendar externally.

Workaround

1. Connect to Exchange Online by using remote PowerShell. For more info about how to do this, see Connect to Exchange Online PowerShell.

2. Run the following command to publish the calendar folder of a mailbox:

   Set-MailboxCalendarFolder -Identity <user>:\Calendar -PublishEnabled:$True -PublishDateRangeFrom ThreeMonths -PublishDateRangeTo SixMonths -DetailLevel LimitedDetails
   

   Note

   Set the -DetailLevel parameter to the value that's appropriate for you. The options are AvailabilityOnly, LimitedDetails, and FullDetails. In this example, the parameter is set to LimitedDetails.

3. Run the following command to view the published URL of the calendar folder:

   Get-MailboxCalendarFolder -Identity <user>:\Calendar
   

More information

For more information about the Set-MailboxCalendarFolder and Get-MailboxCalendarFolder cmdlets, see the following Microsoft websites:

• Set-MailboxCalendarFolder
• Get-MailboxCalendarFolder

Still need help? Go to Microsoft Community.