AsyncAutoResetEvent not working in WCF async method - wcf

Question

I created a WCF service using Visual Studio 2017 Community version (employing TAP). I used the AsyncAutoResetEvent from the Microsoft.VisualStudio.Threading reference but it seems that this waithandle is not getting signalled after calling the Set function. The service is hosted in a console application. The traces generated by the NonBlockingConsole.WriteLine display properly however.
server:
AsyncAutoResetEvent aare = new AsyncAutoResetEvent(false);
public async Task<string> TestfuncAsync()
{
string strRet = "finished";
NonBlockingConsole.WriteLine("before autoresetevent");
await aare.WaitAsync();
NonBlockingConsole.WriteLine("after autoresetevent"); //is not traced even if asyncautoresetevent is set
return strRet;
}
void SetEvent()
{
aare.Set();
NonBlockingConsole.WriteLine("auto reset event set");
}
client UI:
private async void button1_Click(object sender, EventArgs e)
{
string value = await client.TestfuncAsync();
...
}
private void button2_Click(object sender, EventArgs e)
{
client.SetEvent();
}
NonBlockingConsole class: (reused from Does Console.WriteLine block?)
public static class NonBlockingConsole
{
private static BlockingCollection<string> m_Queue = new BlockingCollection<string>();
static NonBlockingConsole()
{
var thread = new Thread(
() =>
{
while (true) Console.WriteLine(m_Queue.Take());
}
);
thread.IsBackground = true;
thread.Start();
}
public static void WriteLine(string value)
{
value = DateTime.Now.ToString("<HH:mm:ss.fff>") + " " + value + " <ThreadID>: " + Thread.CurrentThread.ManagedThreadId.ToString();
m_Queue.Add(value);
}
}