Migrating old GeoFence configuration to GeoServer 2.12 and following

Starting from GeoServer 2.12, the allowDynamicStyles GeoFence configuration option has been moved to the core GeoServer WMS module.

This means that if you had this option active in GeoFence, you have to manually enable the same option in the WMS service configuration page of the GeoServer Admin UI (either globally or on a virtual service by virtual service basis).

See here: WMS settings