Update refguide: Add Custom Action to Workflow Toolbox

Author: Karuna-Mendix

content/en/docs/refguide/modeling/application-logic/workflows/add-action-to-workflow-toolbox.md

@@ -28,7 +28,7 @@ Before starting this how-to, make sure you have completed the following prerequi
 
 * Familiarize yourself with workflow terms. For more information, see [Workflows](/refguide/workflows/). 
 * Install Atlas 3 from the Mendix Marketplace. As a result of installing Atlas 3, your app should contain the following modules that Workflow Commons depends on: Atlas_Core, Atlas_Web_Content, and DataGrid.
-* Your app has the following optional modules [Workflow Commons](https://marketplace.mendix.com/link/component/117066) and [Mendix SSO](https://marketplace.mendix.com/link/component/111349) modules for better developer experience. For more information on how to set up Workflow Commons in an existing app, see [Adding a Workflow to an Existing App: Using Workflow Commons](/refguide/workflow-setting-up-app/).
+* Your app has the following optional modules [Workflow Commons](https://marketplace.mendix.com/link/component/117066) and [Mendix SSO](https://marketplace.mendix.com/link/component/111349) modules for better developer experience. However, the Mendix SSO module is deprecated as of May 1, 2026. You may alternatively use [OIDC SSO](/appstore/modules/oidc/), [SAML](/appstore/modules/saml/), or [LDAP](appstore/modules/ldap/).For more information on how to set up Workflow Commons in an existing app, see [Adding a Workflow to an Existing App: Using Workflow Commons](/refguide/workflow-setting-up-app/).
 
 ## Exposing the Microflow as the Workflow Action