Uno Platform Resource Issue

App.xaml

<Application
    x:Class="Iron.Uno.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Iron.Uno">
	
	<Application.Resources>
		<XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
        <local:ViewModelLocator x:Key="ViewModelLocator"/>
	</Application.Resources>

</Application>

MainPage.xaml

<Page
    x:Class="Iron.Uno.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Iron.Uno"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    DataContext="{Binding Main, Source={StaticResource ViewModelLocator}}"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
      <TextBlock Text="{Binding WelcomeText}" Margin="20" FontSize="30" />
    </Grid>
</Page>

MainViewModel.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace Iron.Uno.ViewModels
{
    public class MainViewModel
    {
        public string WelcomeText => "Hello, Slide!";
    }
}

ViewModelLocator.cs

using Iron.Uno.ViewModels;

using System;
using System.Collections.Generic;
using System.Text;

namespace Iron.Uno
{
    public class ViewModelLocator
    {
        public MainViewModel Main => new MainViewModel();
    }
}