WebView2 initialization in headless mode not work when is invoked by windows service

Hi,
i'm trying to use WebView2 in headless mode to export in pdf a page but when is invoked by a Windows Service doesn't work.

This is the scenario.

I have a web application named "WebAppService" in ASP.NET Core 6.0. running an html page.

var options = new WebApplicationOptions() {
    Args = args,
    ContentRootPath = WindowsServiceHelpers.IsWindowsService() ? AppContext.BaseDirectory : default
};

var builder = WebApplication.CreateBuilder(options);

builder.Services.AddControllers();

if (!Debugger.IsAttached) {
    builder.Host.UseWindowsService();
}

var app = builder.Build();
app.UseStaticFiles();
app.UseRouting();
app.UseEndpoints(endpoints => { endpoints.MapControllers(); });


app.Run("http://localhost:5000");

In the HTML page there is a button and on click is called a web API that execute the console application used for the initialization of WebView2 and the export in pdf.

[Route("[controller]")]
    public class ExportWebViewController:Controller {

        [HttpGet("ExecProcess")]
        public ActionResult ExecProcess() {
            Process.Start("C:\\Sources\\WebView2Headless\\ConsoleApp1\\bin\\Debug\\net6.0-windows\\ConsoleApp1.exe");
            return Ok();
        }
    }

The executable invoked "ConsoleApp1" contains the methods to initialize WebView2 in headless mode, navigate and export in pdf.

static void CreateWebView2() {
    System.Diagnostics.Debugger.Launch();
    CoreWebView2Controller browserController;
    string WEBVIEW2_RUNTIME_FOLDER = @"C:\Sources\WebView2Headless\ConsoleApp1\bin\Debug\WebView2Runtime.110.0.1587.63.x64";
    IntPtr HWND_MESSAGE = new IntPtr(-3);
    var uiThread = new Thread(() => {

        Dispatcher.CurrentDispatcher.Invoke(async () => {
            var environment = await CoreWebView2Environment.CreateAsync(WEBVIEW2_RUNTIME_FOLDER, null, null);

            browserController = await environment.CreateCoreWebView2ControllerAsync(HWND_MESSAGE);
            browserController.CoreWebView2.NavigationCompleted += NavigationComplete;

            browserController.CoreWebView2.Navigate("https://developer.microsoft.com/it-it/microsoft-edge/webview2/");

        });

        Dispatcher.Run();
    });

    uiThread.SetApartmentState(ApartmentState.STA);
    uiThread.Start();
    uiThread.Join();

    void NavigationComplete(object sender, CoreWebView2NavigationCompletedEventArgs args) {
        browserController.CoreWebView2.PrintToPdfAsync(@"C:\Temp\ExportFromWebView2.pdf");
        Console.WriteLine("Export complete!");
    }
}


[STAThread]
static void Main(string[] args) {
    Console.WriteLine("START -> CreateWebView2 Environment...");
    CreateWebView2();
}

Main(args);

When the web application "WebAppService" is running in debug mode in Visual Studio (or invoked by a Console Application), the export works.

When the web application is invoked by a Windows Service, the export doesn't work: the "ConsoleApplication1" is executed, but it stucks at method "CreateCoreWebView2ControllerAsync" (no exceptions are returned).

I'm using WebView2Runtime.110.0.1587.63.x64

Thanks for your help!

Fabio