With SAML you do not need the client id & secret, that is for OAuth2. For Client ID & Secret you can use this module:
You can add this marketplace module ( https://marketplace.mendix.com/link/component/117529 ) to your app. Also install the different dependent modules if you do not have them yet. Follow the documentation of the module to get it to work.
If you want to use SAML with Azure AD you can setup an Enterprise Application with Single Sign On with SAML. That will provide you a Federation Metadata XML that you can use in the configuration of this module ( https://marketplace.mendix.com/link/component/1174 ). Also here download the dependent modules and follow the documentation.
EDIT: please also check this link: https://medium.com/mendix/azure-ad-sso-integration-with-mendix-app-b7bddd1429f6
the market place has a SAML module that you can use. It lets you setup the configuration with a setup wizard.
Here is the link: https://marketplace.mendix.com/link/component/1174
Take a look at the below medium link for Azure AD SSO using OIDC
Hope it helps!!!