How to add a reference to a .Net Core 3.1 project from a .Net standard 2.0?

Question

I have two projects, one which has a target framework.Net Core 3.1 called Common, and another which has a target framework.Net standard 2.0 called XamApp. How do I add a reference in XamApp to Common? I keep getting the error:

Project Common is not compatible with uap10.0.16299 (UAP,Version=v10.0.16299)/win10-arm. Project Common supports: netcoreapp3.1 (.NETCoreApp,Version=v3.1)

I'm making a Xamarin.Forms app, so XamApp supports only.Net Standard 2.0. What target framework do I need to change Common to be?

Answer 1

If you don't need features of 2.1, then yes, to netstandard2.0:)