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Create the Key Distribution Services KDS Root Key

Create the “KDS Root Key” for use with Managed Service Account (MSA) and Group Managed Service Accounts (gMSA). Use the New-KdsRootKey PowerShell cmdlet for set up and initialize the KDS root key.

  1. On the Windows Server 2012 domain controller, run the Windows PowerShell from the Taskbar. (I normally run it as Administrator.)
  2. At the Windows PowerShell, type the following command, and then press ENTER:
    Add-KdsRootKey –EffectiveImmediately

The domain controllers will wait up to 10 hours from time of creation to allow all domain controllers to converge their AD replication before allowing the creation of a gMSA. The 10 hours is a safety measure to prevent password generation from occurring before all DCs in the environment are capable of answering gMSA requests. If you try to use a gMSA too soon the key might not have been replicated to all Windows Server 2012 DCs and therefore password retrieval might fail when the gMSA host attempts to retrieve the password. gMSA password retrieval failures can also occur when using DCs with limited replication schedules or if there is a replication issue.

Even if there is only one DC you still have to wait the 10 hours.  If you don’t want to wait you can refer to the Microsoft TechNet article this information was taken from: https://technet.microsoft.com/en-us/library/jj128430.aspx