I finally got this to work by starting over with a fresh clone of the SDK. Everything is working as it should now.
This didn’t work for me. After doing the git checkout master, I’m getting this on DocumentFormat.OpenXml
Your project.json doesn’t list ‘win’ as a targeted runtime. You should add ‘”win”: { }’ inside your “runtimes” section in your project.json, and then re-run NuGet restore.
ANd this on DocumentFormat.OpenXml.Tests:
Your project is not referencing the “.NETFramework,Version=v4.5” framework. Add a reference to “.NETFramework,Version=v4.5” in the “frameworks” section of your project.json, and then re-run NuGet restore.