Alternately, can just adjust this block of code to see how authentication is being requested:
/**
* Start the php session inside the plugin because session is needed to store callback url.
*/
public function wp_cassify_session_start() {
if(! session_id() ) {
global $wp;
$gateway_mode = WP_Cassify_Utils::wp_cassify_get_option( $this->wp_cassify_network_activated, 'wp_cassify_enable_gateway_mode' );
if ($gateway_mode && $wp->request == "/login") {
session_start();
}
}
}