Azure AD join error code 8018000a

Recently when attempting to perform an Azure AD Join with a Windows 10 v1511 computer I got the following error:

Something went wrong.  The device is already enrolled.  You can contact your system administrator with the error code 8018000a.

That didn’t make sense because I had recently disjoined the computer from Azure AD.  I could find no reference to the object in the Azure portal either.

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