Before you can debug C# code with IL2CPPA Unity-developed scripting back-end which you can use as an alternative to Mono when building projects for some platforms. More info
See in Glossary for your Universal Windows Platform (UWP) application, you need to do the following:
The debugging procedure for UWP applications is the same as for other platforms. For more information on how to debug C# code, refer to Debug C# code in Unity.