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))