PrismApplication.RegisterTypes is called before constructor

Inserting an object in App constructor.

In RegisterTypes I want to register that same object.

public partial class App : PrismApplication
{
    public App(IConfiguration configuration, IPlatformInitializer initializer = null) : base(initializer)
    {
        Configuration = configuration;
    }

    private IConfiguration Configuration { get; }

    protected override void RegisterTypes(IContainerRegistry containerRegistry)
    {
        containerRegistry.RegisterInstance<IConfiguration>(Configuration); // Here Configuration is null.
    }
}

Within the RegisterTypes method, Configuration is null.

Any workaround for this?