"Public folder "<FolderName>" couldn‎'t be mail-enabled" error when you try to migrate public folders to Exchange Online

PROBLEM

When you try to migrate public folders to Exchange Online, the migration fails and you receive an error message that resembles the following:

MigrationPermanentException: Error: Public folder "/<FolderName>" couldn‎'t be mail-enabled. The error is as follows: "No MailPublicFolder entry was found in Active Directory with OnPremisesObjectId=‎'4a66593b-12b0-4742-9e39-1a7dccd5fc7a‎' or LegacyExchangeDN=‎'/CN=Mail Public Folder/CN=Version_1_0/CN=e71f13d1-0178-42a78c4724206de84a77/CN=000000001A4473 90AA6611CD9BC800AA002FC45A0300E7243831D8E5
0446AB3A0E4E3AEBE23500000000715A0000‎'". This failure can happen when MailPublicFolder objects in Exchange Online are out of sync with your Exchange deployment. You may need to rerun the script Export-MailPublicFoldersForMigration.ps1 on your Exchange server, followed by the script Import-MailPublicFoldersForMigration.ps1 on Exchange Online to update MailPublicFolder objects in Active Directory.

CAUSE

This problem occurs if the NON_IPM_SUBTREE system folder contains mail-enabled public folders. Public folders in the NON_IPM_SUBTREE folder don't have to be mail-enabled. They may have been previously mail-enabled because they were in a Microsoft Exchange 2000 Server environment that was running in mixed mode. In this situation, Exchange tries to mail-enable all public folders. 

SOLUTION

Mail-disable all public folders that are mail-enabled in the NON_IPM_SUBTREE folder. For more information about how to mail-disable a public folder, see Mail-enable or mail-disable a public folder.
 

To mail-disable public folders on NON_IPM_SUBTREE, run these commands:

For public folders on Exchange Server 2010

List mail-enabled public folders from NON_IPM_SUBTREE:

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