You will need to create a security manager to get security rules from AD over LDAP, using the MLDAP ESM Module:
[LDAP] base=[domain DN] user class=user user container=CN=Users group container=CN=Enterprise Server User Groups, CN=Micro Focus,CN=Program Data resource container=CN=Enterprise Server Resources, CN=Micro Focus,CN=Program Data [Verify] mode=bind password type=AD
Note that in a production environment you would not want to use your AD administrative ID for the security manager, since that would create a security risk. It is shown only for convenience here.
In production, you would use an ID that had only the necessary permission for the repository, based on your intended use. (Basic ES security functions only need read access to the user information and the folders under cn=Micro Focus,cn=Program Data. If you want to use MFDS to administer ES groups and resources under LDAP, you have to use an account that also has write permission to the MF program data objects.)