Nullable object must have a value when you run the Hybrid Configuration wizard

Original KB number:   3034991


The Hybrid Configuration wizard that's included in the Exchange Management Console in Microsoft Exchange Server 2010 is no longer supported. Therefore, you should no longer use the old Hybrid Configuration wizard. Instead, use the Microsoft 365 Hybrid Configuration wizard. For more information, see Microsoft 365 Hybrid Configuration wizard for Exchange 2010.


When you run the Hybrid Configuration wizard, you receive the following error message when mail flow is being set up between your on-premises environment and Exchange Online:



Updating hybrid configuration failed with error 'Subtask NeedsConfiguration execution failed: Configure Mail Flow
Nullable object must have a value.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at Microsoft.Exchange.Management.Hybrid.MailFlowTask.ValidateRemoteDomain(DomainContentConfig remoteDomain, Boolean inbound, Boolean OnPrem, Boolean enableSecureMail)
at Microsoft.Exchange.Management.Hybrid.MailFlowTask.RemoteDomainsNeedConfiguration(Boolean OnPrem, ITaskContext taskContext, Boolean enableSecureMail, List`1 changedDomains, List`1 addedDomains, List`1 removedDomains)
at Microsoft.Exchange.Management.Hybrid.MailFlowTask.CheckOrVeifyConfiguration(ITaskContext taskContext, Boolean fVerifyOnly)
at Microsoft.Exchange.Management.Hybrid.Engine.ExecuteTask(ITask taskBase, ITaskContext taskContext)


A remote domain that's configured in the on-premises environment has an unexpected value that causes the Hybrid Configuration wizard to fail.


To work around this issue, follow these steps:

  1. Identify the domains that are causing the problem. To do this, run the following command in the Exchange Management Shell:

    Get-RemoteDomain | where{$_.TNEFEnabled -eq $null}

    The domains that contain the unexpected value are listed in the output.

  2. Set the value of the TNEFEnabled parameter to true for each domain that you identified in step 1.

    For example, to set this value for all the domains from step 1, run the following command:

    Get-RemoteDomain | where{$_.TNEFEnabled -eq $null} | Set-RemoteDomain -TNEFEnabled $true
  3. Rerun the Hybrid Configuration wizard.

  4. After the wizard has completed successfully, revert the value of the TNEFEnabled parameter on the domains that you changed in step 2. To do this, run the following command:

    Set-RemoteDomain "name" -TNEFEnabled $null

More information

The Hybrid Configuration wizard is expecting the value of the TNEFEnabled parameter to be either true or false. However, in some cases, the value can be null. For more information, see Set-RemoteDomain.

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