VERIFIED SOLUTION i

Is it mandatory to have Administrator privileges for 'system.user.username' on LDAP/AD in EngageOne Server 4.X?

No, it is not mandatory to have Administrator privileges for user defined under 'system.user.username' on LDAP/AD. It should be a valid LDAP/AD user and belonging to LDAP/AD group specified in property 'system.user.group' under deploy.properties.
UPDATED:  November 27, 2018