Update refguide: Published OData/GraphQL Services

Author: Karuna-Mendix

content/en/docs/refguide/modeling/integration/odata-services/published-odata-services/_index.md

@@ -220,6 +220,10 @@ To set up authentication with Mendix SSO, do the following:
 1. Ensure the [Mendix SSO](/appstore/modules/mendix-sso/) module has been installed and configured in your app.
 2. In the published OData/GraphQL service, choose **Custom** authentication and select the **AuthorizeRequestWithAccessTokenFrom Request** microflow.
 
+{{% alert color="warning" %}}
+Note that 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/).
+{{% /alert %}}
+
 #### Allowed Roles
 
 The allowed roles define which [module role](/refguide/module-security/#module-role) a user must have to be able to access the service. This option is only available when **Requires authentication** is set to **Yes**.