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The operation failed The specified user already exists

Exact Error: the operation failed because the attempt to join this computer to the domain failed the specified account already exists

Solution:  In my existing AD, I went under "Domain Controllers" OU and saw an entry of the host name of the second DC that i have been unsuccessfully attempted before.  I deleted/demoted the second DC from the entry, and went back to the second DC and re-initiated the DCPROMO.  It is now completing the wizard.
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