title: Can't create new .NET Core 3.1 web app in Azure under Windows operating system
body: <p>I spent many hours trying to find some way to create a new .NET Core 3.1 web app under Windows subscription. I found that if you pick up the Runtime stack as .Net Core 3.1 (LTS) the only option is to create an app under the Linux. I tried to play with different regions and Sku and sizes as well but for all cases, it's just the same. There is no option to configure App Insight during the creation time either when using the Linux. <a href="https://i.stack.imgur.com/8DZqS.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/8DZqS.jpg" alt="enter image description here"></a>
  The interesting thing is that when I created the Web App under .net core 3.0 marked as current I was able to deploy .net core 3.1 web app and it all worked including the app insights stuff.
  My question: is it just a bug in the Azure UI that you cannot create .net core 3.1 web app under Windows or there is some specific reason behind it?</p>