Active Directory Agent application is designed for installation on domain controller users accounts. This is the version of Agent dedicated to working in an Active Directory environment, it works only in the active user session Active Directory. It's not required to use AD Agent, because the regular Xopero Agent can also work in the AD environment, but the disadvantage of this solution is that the mapping in this case does not work.
More information on the integration of Xopero with the Active Directory domain can be found here.