Access Denied Exception on WinUI app while using PeerFinder.FindAllPeersAsync()

Gueztt 1

While using the PeerFinder API form Windows.Networking.Proximity I get the exception UnauthorizedAccessException: Access is denied. (0x80070005 (E_ACCESSDENIED)) when using PeerFinder.FindAllPeersAsync(). I'm unable to trace the reason for this. I have enabled App Capabilities for Proximity and Internet.

The same code when used in Console App works just fine.

The issue is also reproducible on UWP app.

Steps to reproduce the bug

Run the app and click on Search for Peers Button.
PeerFinderApp.zip
Screenshots
Exception Screenshot

Screenshot 2022-08-31 131709

Exception Details

Screenshot 2022-08-31 132251

NuGet package version

WinUI 3 - Windows App SDK 1.1.4

Roy Li - MSFT 31,681 Reputation points Microsoft Vendor

2022-09-01T06:17:06.05+00:00

I checked the sample you shared, I noticed that there is an InitApp method which checks if peer discovery using WiFi Direct is supported. Could you please tell me does it says whether support peer discovery when running your app in your device?
Gueztt 1 Reputation point

2022-09-01T06:20:55.71+00:00

Yes, peer discovery using Wifi Direct is supported. The same code runs smoothly as a console app.

Gueztt 1

To provide further context, Here is the minimal code for console app :

internal class Program  
{  
	[STAThread]  **// I dont have any idea what relevance this holds.**  
	private static void Main(string[] args)  
	{  
		SetCurrentProcessExplicitAppUserModelID("PeerFinderApp");  
		PeerFinder.Role = PeerRole.Peer;  
		PeerFinder.AllowWiFiDirect = true;  
		if ((Windows.Networking.Proximity.PeerFinder.SupportedDiscoveryTypes &  
		 Windows.Networking.Proximity.PeerDiscoveryTypes.Browse) !=  
		 Windows.Networking.Proximity.PeerDiscoveryTypes.Browse)  
		{  
			Console.WriteLine("Peer discovery using Wi-Fi Direct is not supported.\n");  
			return;  
		}  
		PeerFinder.Start();  
  
		IReadOnlyList<PeerInformation> peerInfoCollection = null;  
  
		string read1;  
		Console.WriteLine("Enter somthing to search");  
		read1 = Console.ReadLine();  
		if (read1 != null)  
		{  
			Console.WriteLine("Searching for Peers");  
			peerInfoCollection = PeerFinder.FindAllPeersAsync().AsTask().Result;  
		}  
  
		if (peerInfoCollection?.Count == 0)  
		{  
			Console.WriteLine("No peers found");  
		}  
		foreach (var info in peerInfoCollection)  
		{  
			Console.WriteLine("Peer found: {0}", info.DisplayName);  
		}  
	}  
	[DllImport("shell32.dll")]  
	private static extern int SetCurrentProcessExplicitAppUserModelID([MarshalAs(UnmanagedType.LPWStr)] string AppID);   **// I dont have any idea what relevance this holds, too.**  
}

Gueztt 1 Reputation point

2022-09-01T07:52:47.313+00:00

And this is the output of netsh wlan show wirelesscap from cmd.

Further, the windows privacy settings for location and radios are permissive.

Further, Although I'm unable to even get that far, this post mentiones exception in PeerFinder.ConnectAsync(peer); method also.

Seems like this API has been broken since a long time. Should I give up all hope on this API?
Roy Li - MSFT 31,681 Reputation points Microsoft Vendor

2022-09-02T06:35:10.867+00:00

Currently, I don't have a device which support the WiFi direct here. I created a UWP sample based on the sample you shared. I'm asking other engineer to test it. There might be some time delay.
Gueztt 1 Reputation point

2022-09-14T12:16:48.407+00:00

Was your colleague able to find any solution? Thanks.
Roy Li - MSFT 31,681 Reputation points Microsoft Vendor

2022-09-15T03:17:02.39+00:00

@Gueztt I've already asked the team to check about this. But I haven't got a response yet. I'll come back once there is some updates.
Gueztt 1 Reputation point

2022-10-18T12:26:40.217+00:00

Anything on this?

Access Denied Exception on WinUI app while using PeerFinder.FindAllPeersAsync()

Steps to reproduce the bug

Screenshots

NuGet package version