AD Domain join returns 2725

From a PowerShell script I am getting a result code of 2725 when I attempt an Active Directory domain join.  This is the call being made:

  $ReturnValue = $comp.JoinDomainOrWorkGroup($ADJoin_Domain, $ADJoin_Password, "$ADJoin_Domain\$ADJoin_UserName", $ADJoin_OU, 3)

I then see the 2725 in $ReturnValue.ReturnValue.  I have made a search for the meaning of this return value, but have not been able to turn anything up.  The client is a W2K12 machine.  Please help me to discover the cause. 

Thanks!