Timed out error on test configuration for OAuth2 Azure AD SSO

Hello. We had successfully tried and installed your plugin on a WordPress website outside of our company firewall. However, now we are trying it inside of our firewall, and already the testing does not work. We get a Time out error on “test configuration” for OAuth2 Azure AD SSO. We already have proxy settings on wp-config.php like below:
define(‘WP_PROXY_HOST’, ‘real_value’);
define(‘WP_PROXY_PORT’, ‘real_value’);
define(‘WP_PROXY_USERNAME’, ‘real_value’);
define(‘WP_PROXY_PASSWORD’, ‘real_value’);
define(‘WP_PROXY_BYPASS_HOSTS’, ‘localhost’);
Do you have any idea of how to solve this? Thank you very much for your help. My eMail is yeysus gmail com, in Twitter I am @yeysus, we are in a hurry with this.