How do I use contentdialog in winui3

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Win10

NET6.0

I have built an unpackaged app with .Net6 and WinUI3. Before launching the Main Window, i do some checks and API Requests. If one fails, i would like to communicate it to the user.

I built a method:

internal static async void DisplayInfoDialog(string title, string content)
		{
			ContentDialog infoDialog = new ContentDialog()
			{
				Title = title,
				Content = @content,
				CloseButtonText = "Ok",
				XamlRoot = Window.Current.Content.XamlRoot,
			};

			await infoDialog.ShowAsync();
		}

I'm tying to use it like:

DisplayInfoDialog("Fail", "It fails because");

What I have tried:

Currently i'm getting a "System.NullReferenceException: "Object reference not set to an instance of an object.""

Without XamlRoot i'm getting: "System.ArgumentException: "Value does not fall within the expected range."