uwp dispatcher runasync not working

I'm trying to update my UWP App's UI from a non-UI thread. I'm using Dispatcher.RunAsync to make the changes. I have tried changing:

• ToggleSwitch.OnContent and OffContent
• Image.Source
• Checkbox.IsChecked
• Checkbox.Content

Nothing changes.

Currently, I'm reading values from the local settings cache (ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings), but I have tried using bools. No difference.

When debugging, Visual Studio indicates that the properties like Checkbox.IsChecked, etc. do change. However, in the app itself, no changes occur visually.

My current XAML code for the Checkboxes:

<CheckBox x:Name="checkBox1" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="200,93,0,0"/>
<CheckBox x:Name="checkBox2" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="200,125,0,0"/>
<CheckBox x:Name="checkBox3" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="200,157,0,0"/>

The cs code:

public async void updateUI()
{
    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
        {
            // change checkBox1 UI State
            checkBox1.IsChecked = (Convert.ToBoolean(localSettings.Values["test1"])) ? true : false;
            checkBox1.Content = (checkBox1.IsChecked.Value) ? "On" : "Off";

            // change checkBox2 UI State
            checkBox2.IsChecked = (Convert.ToBoolean(localSettings.Values["test2"])) ? true : false;
            checkBox2.Content = (checkBox2.IsChecked.Value) ? "On" : "Off";

            // change checkBox3 UI State
            checkBox3.IsChecked = (Convert.ToBoolean(localSettings.Values["test3"])) ? true : false;
            checkBox3.Content = (checkBox3.IsChecked.Value) ? "On" : "Off";
        });
}

I call updateUI by simply invoking it, like this: updateUI(). And, no, there is no exception or error. Just nothing happens visually.

Any ideas on what I'm doing wrong??