UM-enabled mailbox migration to Exchange Online fails

Symptoms
When you try to migrate a Unified Messaging (UM)-enabled mailbox from on-premises Microsoft Exchange Server to Microsoft Exchange Online, the migration fails with an error that resembles the following:
Mailbox 'USER' in the source forest is currently enabled for Unified Messaging but it can't be enabled for Unified Messaging in the target forest for the following reason: Unified Messaging isn't available in the target forest. Please fix the problem or disable the mailbox for Unified Messaging before you try the operation again.
    + CategoryInfo          : InvalidArgument: (USER:MailboxOrMailUserIdParameter) [New-MoveRequest], RecipientTask
   Exception
    + FullyQualifiedErrorId : [Server=Server,RequestId=RequestId,TimeStamp=TimeStamp] [FailureCategory=Cmdlet-RecipientTaskException] xxxxxxxx,Microsoft.Exchange.Management.RecipientTasks.
  NewMoveRequest
Cause
This issue occurs because Exchange Online cannot find a valid target forest for which you are trying to migrate.
Resolution
To resolve this issue, follow these steps:
  1. Make sure that the user has an Exchange Online license.
  2. Confirm that the value of the LicenseReconciliationNeeded property is False. To do this, run the following Microsoft Online Services Module for Windows PowerShell cmdlets in order:
    • Connect-MsolService
    • Get-MsolUser -UserPrincipalName UPN |fl LicenseReconciliationNeeded

    Note If the value is True, assign an Exchange Online license to the user account. Doing this operation resets the LicenseReconciliationNeeded property to False and enables the migration to continue.
  3. Map the UM mailbox policy on the cloud and on the on-premises Exchange server. To do this, follow these steps:
    1. Run the following command in Exchange Online PowerShell:
      Set-UMMailboxPolicy -identity "Office365UMPolicy" -SourceForestPolicyNames "OnPremisesUMPolicy"
    2. Run the following command in the on-premises Exchange Management Shell:
      Set-UMMailboxPolicy -identity "OnPremisesUMPolicy" -SourceForestPolicyNames "Office365UMPolicy"
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Properties

Article ID: 3070788 - Last Review: 08/11/2016 02:39:00 - Revision: 2.0

Microsoft Exchange Online, Microsoft Lync Online, Skype for Business Online

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