Where ModelControllerClient is initialised in process with CBH AuthenticationConfiguration takes priority. ---------------------------------------------------------------------------------------------------------- Key: ELY-1969 URL: https://issues.redhat.com/browse/ELY-1969 Project: WildFly Elytron Issue Type: Bug Components: Authentication Client Reporter: Darran Lofthouse Assignee: Darran Lofthouse Priority: Major Fix For: 1.12.0.CR4 In ProtocolConnectionUtils we have the following code to pass in the provided CallbackHanldler: - {code:java} if (handler != null) { mergedConfiguration = mergedConfiguration.useCallbackHandler(handler, DEFAULT_CALLBACK_KINDS); } {code} However the AuthenticationClient performs the following sanitation of the specified KINDS: - {code:java} case SET_USER_CB_KINDS: // SANITAZE on above content if (this.principal != null) { sanitazeOnMutation(SET_PRINCIPAL); } if (this.credentialSource != null) { sanitazeOnMutation(SET_CRED_SOURCE); } if (this.setRealm != null) { sanitazeOnMutation(SET_REALM); } if (this.parameterSpecs != null) { sanitazeOnMutation(SET_PARAM_SPECS); } if (this.keyManagerFactory != null) { sanitazeOnMutation(SET_KEY_MGR_FAC); } break; {code} Before passing in the CallbackHandler and specifying which KINDS is applies to the ProtocolConnectionUtils call should first remove the duplicates from the configuration.