I've never worked with the Hololens myself, but I don't see a reason why it wouldn't work. You'll have to post which errors you are getting in order for us to be able to help you, however. AllowUnsafeBlocks is in the .csproj of your Unity project root folder (the one above the Assets folder). Right click and open with notepad to be able to edit them. You only need to change those values to be able to attach Visual Studio to Unity for debugging though, it will not cause any errors. I'll need to see your code in PositionAtFaceScreenSpace to be able to get an idea what's giving you the null reference.