SOLVED: Outlook - Cannot copy this folder because it may contain private items

How to fix Outlook error - Cannot copy this folder because it may contain private items by granting permissions to view private items using PowerShell 

Cannot move the items. Cannot copy this folder because it may contain private items

You will see this error message if you try to copy messages that have the sensitivity private tag set.

Allow mailbox delegates to view private items using PowerShell

To workaround this issue, you'll need to allow mailbox delegates to view private items using PowerShell.

Office 365 - Allow delegates to view private items in a shared mailbox using PowerShell
https://techlabs.blog/categories/office-365/office-365-allow-delegates-view-private-items-shared-mailbox-using-powershell

You can also create an Exchange Online transport rule to prevent this issue from happening again.

Exchange Online transport rule to remove email header sensitivity private
https://techlabs.blog/categories/office-365/exchange-online-transport-rule-remove-email-header-sensitivity-private