HelloWorld Cs sample doesn't build in VS 2019 Community

[WheretIB]

HelloWorld project doesn't have any Visual Studio SDK references, so it fails to find them:

1>Build started 24-Apr-20 9:50:28.
1>GenerateTargetFrameworkMonikerAttribute:
1>Skipping target "GenerateTargetFrameworkMonikerAttribute" because all output files are up-to-date with respect to the input files.
1>CoreCompile:
1>  L:\dev\VS2019\MSBuild\Current\Bin\Roslyn\csc.exe /noconfig /nowarn:1701,1702,2008 /nostdlib+ /errorreport:prompt /warn:4 /define:DEBUG;TRACE /errorendlocation /preferreduilang:en-US /highentropyva+ /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Core.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Xml.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\Debug\HelloWorld.dll /ruleset:"L:\dev\VS2019\Team Tools\Static Analysis Tools\\Rule Sets\AllRules.ruleset" /subsystemversion:6.00 /target:library /utf8output /langversion:7.3 HelloWorldDataItem.cs _HelloWorldService.cs Properties\AssemblyInfo.cs "C:\Users\User\AppData\Local\Temp\.NETFramework,Version=v4.5.AssemblyAttributes.cs"
1>  Using shared compilation with compiler from directory: L:\dev\VS2019\MSBuild\Current\Bin\Roslyn
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\HelloWorldDataItem.cs(4,17,4,29): error CS0234: The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\HelloWorldDataItem.cs(5,17,5,29): error CS0234: The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(4,17,4,29): error CS0234: The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(5,17,5,29): error CS0234: The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\HelloWorldDataItem.cs(31,40,31,51): error CS0246: The type or namespace name 'DkmDataItem' could not be found (are you missing a using directive or an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(16,38,16,57): error CS0246: The type or namespace name 'IDkmCallStackFilter' could not be found (are you missing a using directive or an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(20,29,20,48): error CS0246: The type or namespace name 'IDkmCallStackFilter' could not be found (are you missing a using directive or an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(20,65,20,80): error CS0246: The type or namespace name 'DkmStackContext' could not be found (are you missing a using directive or an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(20,95,20,112): error CS0246: The type or namespace name 'DkmStackWalkFrame' could not be found (are you missing a using directive or an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(20,9,20,26): error CS0246: The type or namespace name 'DkmStackWalkFrame' could not be found (are you missing a using directive or an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\_HelloWorldService.cs(20,29,20,48): error CS0538: 'IDkmCallStackFilter' in explicit interface declaration is not an interface
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\HelloWorldDataItem.cs(51,53,51,68): error CS0246: The type or namespace name 'DkmStackContext' could not be found (are you missing a using directive or an assembly reference?)
1>L:\dev\vs_extensions\ConcordExtensibilitySamples\HelloWorld\Cs\dll\HelloWorldDataItem.cs(69,61,69,76): error CS0246: The type or namespace name 'DkmStackContext' could not be found (are you missing a using directive or an assembly reference?)
1>
1>Build FAILED.

You have to add a reference to
<Reference Include="Microsoft.VisualStudio.Debugger.Engine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />

[gregg-miskelly]

That shouldn't be needed, as the project has a PackageReference to Microsoft.VisualStudio.Debugger.Engine. If you crank up the build verbosity, can you see the package being checked?

    <PackageReference Include="Microsoft.VisualStudio.Debugger.Engine" Version="$(ConcordPackageVersion)">
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>

[WheretIB]

I see there's a reference in the csproj file, but it is not displayed in Solution explorer.

Solution Explorer

I can't see any mention of that package in Detailed MSBuild log file: Build Log

[WheretIB]

If I open NuGet package manager, I can see two packages listed and installed but the project still does not build.
NuGet Package Manager

And 'Restore NuGet Packages' menu option doesn't help.

[WheretIB]

I wanted to reinstall the package, and as soon as I removed the Debugger package, the VSDConfigTool got restored.
NuGet Package Manager 2

[WheretIB]

Looks like I was missing these two checkboxes in Visual Studio settings:
NuGet Settings

After turning them both on, packages are restored in a clean git clone and project builds without an error.