When call DiscoverDevices() -- System.Runtime.InteropServices.COMException: 'A method was called at an unexpected time.'

[VolodymyrTrishynGL]

OS

Edition Windows 10 Pro Version 21H2 OS build 19044.1889 Experience Windows Feature Experience Pack 120.2212.4180.0

Project

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0-windows10.0.19041.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="InTheHand.Net.Bluetooth" Version="4.0.30" />
  </ItemGroup>
</Project>

Code

using InTheHand.Net.Sockets;

namespace BluetoothCSharpTest
{
    class Program
    {
        static void Main(string[] args)
        {
            BluetoothClient client = new BluetoothClient();
            var devices = client.DiscoverDevices();
            Console.ReadLine();
        }
    }
}

Bluetooth on Windows settings -- On

Result

Details

System.Runtime.InteropServices.COMException
  HResult=0x8000000E
  Message=A method was called at an unexpected time.

  Source=Microsoft.Windows.SDK.NET
  StackTrace:
   at WinRT.DelegateExtensions.DynamicInvokeAbi(Delegate del, Object[] invoke_params)
   at ABI.Windows.Foundation.IAsyncOperationMethods`1.GetResults(IObjectReference _genericObj)
   at InTheHand.Net.Sockets.BluetoothClient.PlatformDiscoverDevices(Int32 maxDevices)
   at BluetoothCSharpTest.Program.Main(String[] args) in D:\Projects\DiscovererEnjine\DiscovererEnjine\Program.cs:line 10

[VolodymyrTrishynGL]

DiscoverDevices() works well with project type Console App (.Net framework). So I think the problem is UWP applications.

[FifthCloud]

Have put that code within a Class Library or even directly into the Console App and I am getting the same exact error for "DiscoverDevices()".

Not exactly sure what to do in this scenario. Seems to me that it might have something to do with sync or async? Guessing here.