NetworkDiscoveryHandler does not work, it always returns 0 in the count parameter, I have a zc300 printer connected in the LAN network.(10.10.10.1)

private class NetworkDiscoveryHandler : DiscoveryHandler
{

private List printers = new List();
private AutoResetEvent discoCompleteEvent = new AutoResetEvent(false);

public void DiscoveryError(string message)
{
Console.WriteLine($"An error occurred during discovery: {message}.");
discoCompleteEvent.Set();
}

public void DiscoveryFinished()
{
discoCompleteEvent.Set();
}

public void FoundPrinter(DiscoveredPrinter printer)
{
printers.Add(printer);
}

public List DiscoveredPrinters
{
get => printers;
}

public AutoResetEvent DiscoveryCompleteEvent
{
get => discoCompleteEvent;
}
}

public ObservableCollection DiscoveredPrinters { get; } = new ObservableCollection();