Unexpected binding behavior in UWP

[EpsilonHalo]

I cannot get binding to work when the controls that define them initially load. I have a couple RadioButtons that bind IsChecked to an enum the following way:

<RadioButton Content="My Enum Field">
    <RadioButton.IsChecked>
        <Binding 
            Path="ViewModel.MyProperty" 
            Converter="{StaticResource ValueEqualsParameterConverter}"
            Mode="TwoWay"
            UpdateSourceTrigger="PropertyChanged">
            <Binding.ConverterParameter>
                <local:MyEnum>MyEnumField</local:MyEnum>
            </Binding.ConverterParameter>
        </Binding>
    </RadioButton.IsChecked>
</RadioButton>

The converter I use is:

public class ValueEqualsParameterConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        return value == parameter;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        return parameter;
    }
}

When you load the Page that displays these RadioButtons, the initial value is not checking the appropriate RadioButton. I have confirmed the value is changing when you manually check the RadioButtons by printing to the console from the view model.

I am new to UWP and I’ve never had this issue with regular WPF so any help is appreciated!

Note: I cannot tag UWP, WPF, XAML, or C#, but these are the relevant technologies I am using.