Unable to build C# UWP

[HMaged]

I had a unity project that required to be embedded in a UWP C# project with implemented functions for the connection between them
So I went through the example in the CSharpProjectExample DesktopSamples/UniversalWindowsPlatformSamples/CSharpProjectExample and tried to do the same but I always end but with a c++ build only. kindly advise

The Unity version is 2021.3.19f1