Looks like you're trying to build for ARM64. This is a known Visual Studio bug: https://developercommunity.visualst...ld-uwp-app-for-arm64-that-references-arm.html It was fixed in Visual Studio 2019 update 16.2.
You need to just install Visual Studio 2019. You're currently on 2017. You can download VS 2019 here: https://visualstudio.microsoft.com/downloads/ Unity is fully compatible with it.