New Visual Studio Build server

I've been having a look at the new VSO build server which seems like a great step forward, but have a Nuget issue with Raygun.

Getting this error when I do a build. Source\xxx\Global.asax.cs(10,7): Error CS0246: The type or namespace name 'Mindscape' could not be found (are you missing a using directive or an assembly reference?) 2>Global.asax.cs(10,7): error CS0246: The type or namespace name 'Mindscape' could not be found (are you missing a using directive or an assembly reference?) [C:\a\92c1f7a3\xx\Source\xxx.csproj]

Anyone know why the build isn't pulling the Nuget package correctly? I get a similar issue with my current builds on AppVeyor so I think its something not set up correctly on my solution.

thanks, Stephen