Exchange Online and Microsoft.Exchange.Data.SharingPolicyAction is invalid error on Get-MailboxFolderPermission

Hello,

Recently we got an issue on Exchagne Online, for one mailbox (yes 1! :)) we were not able to properly read permissions, the error was:

•	WARNING: An unexpected error has occurred and a Watson dump is being generated: Value specified for a parameter of type <span id="mce_SELREST_start" style="overflow:hidden;line-height:0;"></span>Microsoft.Exchange.Data.SharingPolicyAction is invalid<span id="mce_SELREST_end" style="overflow:hidden;line-height:0;"></span>: 0.
•	Parameter name: allowedActions
•	Value specified for a parameter of type Microsoft.Exchange.Data.SharingPolicyAction is invalid: 0.
•	Parameter name: allowedActions
•	    + CategoryInfo          : NotSpecified: (:) [Get-MailboxFolderPermission], EnumOutOfRangeException
•	    + FullyQualifiedErrorId : Microsoft.Exchange.ExchangeSystem.EnumOutOfRangeException,Microsoft.Exchange.Management.StoreTasks.GetMailboxFolderPermission
•	    + PSComputerName        : ps.outlook.com

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After contacting Microsoft they suggested running following command:

Get-SharingPolicy | Set-SharingPolicy -Domains Anonymous:CalendarSharingFreeBusySimple,*:CalendarSharingFreeBusyDetail

After running the above command we were able to properly rad permissions. More details about sharing policies can be found here.

 

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