Problem with GutHub Build

Hi I have recently started to learn git so that I can help contribute to the project.
Anyhow I fixed a bug but when I submit my changes I get an error with the builds on git.

This is the error

Windows\GamerServices\Guide.cs(75,24): error CS0234: The type or namespace name 'Store' does not exist in the namespace 'Windows.Services' (are you missing an assembly reference?) [C:\BuildAgents\MonoGameWin2\work\59a4b66548a5cef5\MonoGame.Framework\MonoGame.Framework.Net.WindowsUniversal.csproj]

Windows.Services.Store is a valid assembly for Windows Universal apps

Here is my reference to it.

#if WINDOWS_UAP
using Windows.Services.Store; //need to check if trial or not
#endif

So am I missing something or are the build servers wrong here.

Here is the pr

Thanks Matt