Login_User adk api call returns 403

[yogendragautam]

I am using trial looker account and trying to embed the data in custom visualisation.

When I try to use login_user using looker sdk. I am getting 403 forbidden error with below error message

{

    "message": "Unsupported in Looker (Google Cloud core)",

    "documentation_url": "https://cloud.google.com/looker/docs/r/err/4.0/403/post/login/:user_id"

}