Error creating a database availability group in Exchange Server 2013. The computer account 'name' could not be validated.

When creating a new database availability group in Exchange Server 2013 you may see the following error.

In this case open Active Directory Users and Computers and find the Computer Account that matches the name of the database availability group and edit the security of this account and ensure that the computer account of the mailbox server you are trying to add has permissions to this object.


A server-side database availability group administrative operation failed. Error The operation failed. CreateCluster errors may result from incorrectly configured static addresses. Error: The computer account 'DAGNAME' could not be validated.

Access was denied. Check that the current user (NT AUTHORITY\SYSTEM) has permissions to create computer accounts in the domain or to claim the computer account.. [Server: DEMO-EX13-01.demonstrationex13.int]
    + CategoryInfo          : InvalidArgument: (:) [Add-DatabaseAvailabilityGroupServer], DagTaskOperationFailedExcept
   ion
    + FullyQualifiedErrorId : [Server=DEMO-EX13-02,RequestId=35b04581-daaf-407b-8e11-9b7cfa6c15b2,TimeStamp=06/01/2015
    16:17:37] [FailureCategory=Cmdlet-DagTaskOperationFailedException] 1A155DBF,Microsoft.Exchange.Management.SystemC
  onfigurationTasks.AddDatabaseAvailabilityGroupServer
    + PSComputerName        : demo-ex13-02.demonstrationex13.int


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