Get-MailboxFolderPermission – The security principal specified is already on the permission set

Posted on by

Are you getting this error when running Get-MailboxFolderPermission?

PS E:\> Get-MailboxFolderPermission deptcalendar@company.com:\calendar
The security principal specified is already on the permission set.
    + CategoryInfo          : NotSpecified: (:) [Get-MailboxFolderPermission], CorruptDataException
    + FullyQualifiedErrorId : [Server=ZN1UR12MB0288,RequestId=b4f155be-a238-4a98-8b3f-f3d9258e22d2,TimeStamp=6/19/2018 10:10:41 PM] [FailureCategory=Cmdlet-CorruptDataException] F8D77EE2,Microsoft.Exchange.Management.StoreTasks.GetMailboxFolderPermission
    + PSComputerName        : outlook.office365.com

The error message seems cryptic, right? But it is not. It means there is a DUPLICATE entry for the same user (security principal) is in the permission set for the calendar folder permissions.

So how do we fix it?

The ONLY way is to use Outlook to remove the duplicate entry.

Yes, that means

  1. give yourself full access permission to the mailbox,
  2. create an Outlook profile (or just a calendar),
  3. go to Calendar, right click and go to properties, & then Permissions
  4. remove the duplicate user entry

Enjoy. 🙂

1 thought on “Get-MailboxFolderPermission – The security principal specified is already on the permission set”

  1. Pingback: Exchange Online: Calendar Permissions – “Some Permissions cannot be displayed” – Anand, the Architect

Leave a Reply

Fill in your details below or click an icon to log in:

Gravatar
WordPress.com Logo

You are commenting using your WordPress.com account. ( Log Out /  Change )

Google photo

You are commenting using your Google account. ( Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. ( Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. ( Log Out /  Change )

Cancel

Connecting to %s