Auth0 and Palo Alto Networks integration

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I am testing the SAML integration for Palo Alto Networks admin users when trying to access the WebGUI. The application is working, but I am having issues with the SSO authentication. I need to be able the Auth0 send back the actual username value, but it is not doing so. After the redirection to Auth0/SAML SSO, the user is successfully authenticated, but the access is denied in the firewalls because the firewall is seeing either the email or user_id and not the username. I am using the default free trial connection “Username-Password-Authentication.” I have tried different settings on the DB connection, but it’s not working. Do you know how can I do for the Auth0 to properly send username information to Palo Alto firewall?