Sourcelink not working

Same symptoms as [here](https://github.com/PrismLibrary/Prism/issues/2119).

In my case I am building a netcoreapp3.1 library and referencing it in a netcoreapp3.1 .exe.

Nuget package explorer gives same info as shown in referenced ticket above.

See also [this](https://github.com/clairernovotny/DeterministicBuilds/issues/4).

I also tried [this](https://github.com/dotnet/sourcelink/issues/572) just trying anything I thought would work.

Triple checked that I configured VS according to [this](http://www.aaronstannard.com/visual-studio-sourcelink-setup/).

First time trying to implement this. Spent all day working on this with zero success. What am I doing wrong?

dotnet --version
3.1.300

netcoreapp3.1
0.0.30
me
me

project
0.0.30.0
true
https://github.com

https://github.com
git
2020 me
See Repository

true

true

true
snupkg
LICENSE











$([System.IO.Path]::Combine('$(IntermediateOutputPath)','$(TargetFrameworkMoniker).AssemblyAttributes$(DefaultLanguageSourceExtension)'))






















True