While attempting to run the AD Object Merge, the following error is seen in the log file.
ERROR: [7437-1-132-80070005] Unable to enable object.
12:51:52  Access is denied.
12:51:52 Source: Active Directory
12:51:52 Description: General access denied error
The user account which is specified in the "User Name" field may require the @domain.com to be added for proper authentication.
Use the format UserName.Domain.Com as the login credentials when entering the information in the AD Object Merge GUI.