A specific account cannot be selected for migration under the Quest MMAD tool
Check first in the target domain in the Active Directory Users and Computers and search for the account.
right click and select properties.
search for the Attribute Editor, and look for the AdminCount set to 1 or different to 0.
Also look n the security tab and search if the account is part of a security group of the account if the Administrator if the account is part of the Administrator group.
If the account is part of the administrator or Domain user. Switch to the MMAD console.
Search for the pair properties where the migration is taken place.
search for skip objects.
uncheck the box that indicates "Active Directory objects".
Click ok.
When going back to the the migration session the account will appear in the source.