We use Token generated in Account console to make REST API calls. you can try this work around if your use case allows to use token instead of userid/password.

Below is an example in python.

  user_json = {

  "schemas": [ "urn:ietf:params:scim:schemas:core:2.0:User" ],

  "userName": f"{username}",

  "name": {'familyName': f'{last_name}', 'givenName': f'{first_name}'}

  }

  headers = { "Authorization": f"Bearer {token}"}

  url = 'https://accounts.cloud.databricks.com/api/2.0/accounts/<account_id>/scim/v2/Users'

  result = requests.post(url, headers=headers, data=json.dumps(user_json))