Always use the configuration API name with Cloudera Director.
See https://www.cloudera.com/documentation/enterprise/properties/5-14-x/topics/cm_props_cdh5140_hue.html... for the API names.
This is a Role config (not service-wide) so the config must be placed in each instance group that contains a hue load balancer role.
# service-wide configs are placed at the cluster level
# role configs are placed in the instance groups