How to use addFirebase of the Firebase Management API

I want to call addFirebase of Firebase Management API. This api can add firebase for a project of GCP. I try here

But, I get only an error:

{
  error: {
    code: 403,
    message: 'The caller does not have permission',
    status: 'PERMISSION_DENIED'
  }
}

my service account have owner role.
If the Owner can't call, who on earth can call? I don't have an idea.

I watch people who have same issue in stackoverflow. But,
There was no answer I was looking for.

So, I write now here!!!!!

Please tell me there!

Documents

https://firebase.google.com/docs/projects/api/reference/rest
https://firebase.google.com/docs/projects/api/workflow_set-up-and-manage-project
https://stackoverflow.com/questions/55757947/403-the-caller-does-not-have-permission-for-firebase-management-api-addfirebase
https://stackoverflow.com/questions/54773388/firebase-management-api-projects-addfirebase-permission-denied
https://stackoverflow.com/questions/58955308/403-when-using-firebase-api-to-create-a-project-as-an-owner-user-not-a-service