How to return Keycloak token after authentication via external idp

Question

I need to log in to an external idp using keycloak. The initiator of the authorization chain is the frontend. To test this chain I request the endpoint:

https://keycloak_uri/realms/realm/protocol/openid-connect/auth?client_id=my-client&redirect_uri=web_page_uri&response_type=code&scope=openid

where the web_page_uri is the uri on the site from which we came to keycloak -> then to the sso login form of the external idp.

The problem is that as a result of authentication, Keycloak creates a session, but in my project the frontend and backend work with the token.

Question: How do I return my keycloak token? How can I return it to the frontend after SSO authentication? I want to know where to find the token immediately after the redirect to the frontend and how to return the Bearer token in the Authorization header.

• Franck: Your reproduction steps seems to be missing your frontend and backend steps. You don't access Keycloak directly but first with your frontend.
• pickstar: @Franck I have made adjustments to the description.