Azure AD B2C and MSAL, Embedded Custom Web UI for instantiating login window in .NET Core WPF App

EmbeddedCustomWebUI.cs

internal class EmbeddedCustomWebUI : ICustomWebUi
{
  public const int DefaultWindowWidth = 450;
  public const int DefaultWindowHeight = 600;

  private readonly Window _windowOwner;
  private readonly string _windowTitle;
  private readonly int _windowWidth;
  private readonly int _windowHeight;
  private readonly WindowStartupLocation _windowStartupLocation;

  public EmbeddedCustomWebUI(Window owner,
      string title = "Sign in",
      int windowWidth = DefaultWindowWidth,
      int windowHeight = DefaultWindowHeight,
      WindowStartupLocation windowStartupLocation = WindowStartupLocation.CenterOwner)
  {
      _windowOwner = owner ?? throw new ArgumentNullException(nameof(owner));
      _windowTitle = title;
      _windowWidth = windowWidth;
      _windowHeight = windowHeight;
      _windowStartupLocation = windowStartupLocation;
  }

  public Task<Uri> AcquireAuthorizationCodeAsync(Uri authorizationUri, Uri redirectUri, CancellationToken cancellationToken)
  {
      var taskCompletion = new TaskCompletionSource<Uri>();
      _windowOwner.Dispatcher.Invoke(() =>
      {
          new CustomLoginWindow(authorizationUri, redirectUri, taskCompletion, cancellationToken)
          {
              Owner = _windowOwner,
              Title = _windowTitle,
              Width = _windowWidth,
              Height = _windowHeight,
              WindowStartupLocation = _windowStartupLocation,
          }.ShowDialog();
      });

      return taskCompletion.Task;
  }
}