auth.get_last_response_xml() has user data and auth.logout() is logging-out , but auth.process_response() is None and auth.is_authenticated() is False

[gabrielakuhn]

Hello,

I am building an app which is similar to Flask structure (I am not using any framework, but I am using werkzeug) so I am following the Flask sample here

I have my saml_settings working properly (I guess) because I can redirect for my IDP and my IDP is redirecting to my assertionConsumerService endpoint.

But when handle the POST in my assertionConsumerService endpoint, I cannot retrieve the SAML AttributeStatement (the data idp is sending back to me)

In auth = OneLogin_Saml2_Auth(http_fields, self.saml_settings)

my auth.process_response() is None and my auth.is_authenticated() is False

However in my SAML Tracer tool I can see the attributes there in the POST.
and If I do auth.get_last_response_xml() I also got the xml response with all the attributes (name, surname, email of the user).

So If I am getting back data somehow from the IDP why the authentication is False and the process_response() is None?
My auth.logout() is also working fine (logging out the user)