How does PasswordExpired event work?

I tried some code like this:

PasswordConnectionInfo passwordConnection = new PasswordConnectionInfo(host, ssh_port, username, password);
passwordConnection.PasswordExpired += new EventHandler<AuthenticationPasswordChangeEventArgs>(this.HandlePasswordExpiredEvent);

With this method as the handler:

     private void HandlePasswordExpiredEvent(object reciever,  AuthenticationPasswordChangeEventArgs args)
        {
            throw new SSHPasswordExpiredException($"Password for user {args.Username} has expired.");
        }

It doesn't seem that HandlePasswordExpiredEvent is ever called, even when the password is expired. Am I misunderstanding how this is supposed to work?

Start by tracing the PasswordConnectionInfo.PasswordExpired event through the authentication flow and determine when it is expected to fire. Reproduce the expired-password case and compare the observed behavior with the event's documented contract; done means the cause of the missing callback and the expected behavior are established.