NotSignedInError when trying t connect to Tableau Server API

Hi folks,

I'm trying to connect to the Tableau API using the getting started documentation availabe here: https://tableau.github.io/server-client-python/docs/, but I'm getting the error below:

NotSignedInError: (b'<?xml version=\'1.0\' encoding=\'UTF-8\'?><tsResponse xmlns="http://tableau.com/api" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tableau.com/api https://help.tableau.com/samples/en-us/rest_api/ts-api_3_19.xsd"><error code="401001"><summary>Signin Error</summary><detail>Error signing in to Tableau Server</detail></error></tsResponse>', 'http://tableau.rentcars.com/api/3.19/auth/signin')

My code is:

tableau_auth = TSC.TableauAuth(usr_parameters.usr_admin, usr_parameters.pwd_admin, usr_parameters.site)
server = TSC.Server(usr_parameters.url, use_server_version=True)
 
with server.auth.sign_in(tableau_auth):
    all_datasources, pagination_item = server.datasources.get()
    print("\nThere are {} datasources on site: ".format(pagination_item.total_available))
    print([datasource.name for datasource in all_datasources])

The package "tableauserverclient" version is:

Name: tableauserverclient
Version: 0.31
Summary: A Python module for working with the Tableau Server REST API.
Home-page: 
Author: 
Author-email: Tableau <github@tableau.com>
License: The MIT License (MIT)

I'm using the admin credentiais, the same used in the website, so I think the issue is not with user and password..

I didn't find any useful information to solve this issue.

Any guess?

Tks

Rubens