Dear,

Please find this component 
https://www.outsystems.com/forge/component-overview/13030/keycloak-sso-oml-o11#:~:text=You%20can%20use%20both%20of,OutSystems

Kindly go through it , 

just take it as example 

and use your configuration and own secured way to do a secure connection and do the SSO and authentication for your application.

Please check the below link. I hope it can help sort out your issue.

https://www.outsystems.com/forums/discussion/48404/outsystem-11-integrate-with-keycloak/

Hello,

You can use the built-in platform capabilities to integrate OutSystems 11 with KeyCloak for authentication of End Users (using SAML 2.0) or IT Users (using OpenID Connect):

https://success.outsystems.com/documentation/11/user_management/end_users_authentication/

https://success.outsystems.com/documentation/11/managing_outsystems_platform_and_application_lifecycle/manage_it_users/it_users_integration_with_external_idp_via_openid_connect/