Custom SSO authentication handler is not getting triggered after upgrading from AEM 6.2 to 6.4 .Can anyone share the process/examples for creating custom sso auth handler for AEM 6.4 version.
Did you try looking for the authentication handler at host:port/system/console/slingauth?
You can refer to Adobe Experience Manager Help | Creating a Custom Authentication Handler for Adobe Experience Manage... for detailed steps to setup custom authentication handler.