I need to support older platforms (mobile and computer) as well as the cutting edge across every device. I recently created a cross-platform solution using .NETStandard v2 and Azure Mobile App Services to find out that the UWP project is not compatible to my Lumia 1520 because the latest version of Windows is not available on it. I need to use Push Notifications. I am in a older Xamarin Prototype to Production conundrum. Which solution template should I use?