[keycloak-user] Authorization Code Grant

Hi All, I have a keycloak running with a test realm and someone client, this has an admin/admin user, I want to use Authorization Code Grant(seems direct access grant in keycloak) but not sure if I am misunderstanding something my Application is a desktop one that has its own login window, inside this i am sending a request to get a token like POST http://localhost:9080/auth/realms/test/protocol/openid-connect/token wit body grant_type=password&clientid=someone&username=admin&password=admin this is returning the json with access_token, expires_in, refresh_toke, etc seems all good. from here if I want to get user info http://localhost:9080/auth/realms/test/protocol/openid-connect/userinfo setting header authorization=Bearer code_token i am getting 401 unauthorized with { "error": "invalid_token", "error_description": "Token invalid: Token is not active" } should I do a new request with grant_type=authorization_code&code=access_token to interchange the current for a long one? and handle the refresh token later? sorry if this is a common or simple issue i am not getting working.