Hi Aman,
There are 2 types of authentication on the platform, for IT Users (Service Studio, Service Center, Lifetime, etc.), and Application Users (with access to applications).
I believe you want to configure an external provider to authenticate application users.
See the documentation:
https://success.outsystems.com/Documentation/11/Developing_an_Application/Secure_the_Application/End_Users/End_Users_Authentication
These are the external authentication mechanisms offered by the platform, and there is a guide on how to use each type.
LDAPAuthenticates the end user against your LDAP server, either using LDAP configured for Active Directory or standard LDAP.
Check how to Configure LDAP Authentication.SAML 2.0Uses SAML-based authentication to authenticate the end users with Single Sign-On (SSO) provided by commercial Identity Provider companies like OneLogin and PingFederated.
Check how to Configure SAML 2.0 Authentication.Azure ADUses SAML-based authentication to authenticate the end users with Single Sign-On (SSO) provided by the Azure AD Identity Provider.
Check how to Configure Azure AD Authentication.OktaUses SAML-based authentication to authenticate the end users with Single Sign-On (SSO) provided by Okta.
Check how to Configure Okta Authentication.
Regards,
Pedro Costa