The UnaryOperator passed to AuthenticationConfiguration.createSaslClient needs to wrap inner most factory. ---------------------------------------------------------------------------------------------------------- Key: ELY-789 URL: https://issues.jboss.org/browse/ELY-789 Project: WildFly Elytron Issue Type: Bug Components: Authentication Client Reporter: Darran Lofthouse Assignee: Darran Lofthouse Priority: Critical Fix For: 1.1.0.Beta16 The UnaryOperator is supposed to offer a final override configuration so needs to wrap the inner factory not the outer one as the outer one already has configuration based modifications applied to it so the effect of the UnaryOperator is ignored.