The .net solution is refencing projects which are not available in this repo.

[CampionFabio]

The project file src/AdvantagePlatform.csproj is referencing the following project files, by path:

 <ItemGroup>
    <ProjectReference Include="..\..\..\LTI\LtiAdvantage\src\LtiAdvantage.IdentityServer4\LtiAdvantage.IdentityServer4.csproj" />
    <ProjectReference Include="..\..\..\LTI\LtiAdvantage\src\LtiAdvantage\LtiAdvantage.csproj" />
  </ItemGroup>

And the solution file AdvantagePlatform.sln:

Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LtiAdvantage.IdentityServer4", "..\..\LTI\LtiAdvantage\src\LtiAdvantage.IdentityServer4\LtiAdvantage.IdentityServer4.csproj", "{1CB80393-12A0-42D9-B9EC-D6AF22C00F4D}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LtiAdvantage", "..\..\LTI\LtiAdvantage\src\LtiAdvantage\LtiAdvantage.csproj", "{9CF5D26C-B002-48F8-BC08-77DBE61B3FF2}"
EndProject

I believe AdvantagePlatform.csproj should be referencing the related nuget packages and the Solution file should not be referencing these projects

[CampionFabio]

Attempting fix this by removing these references and adding the current nuget versions yeilds the following error:

Version conflict detected for Microsoft.Extensions.Configuration.Abstractions. Install/reference Microsoft.Extensions.Configuration.Abstractions 8.0.0 directly to project AdvantagePlatform to resolve this issue. 
 AdvantagePlatform -> LtiAdvantage 2.0.1 -> Microsoft.Extensions.Configuration.Json 8.0.1 -> Microsoft.Extensions.Configuration.Abstractions (>= 8.0.0) 
 AdvantagePlatform -> Microsoft.AspNetCore.App 2.2.0 -> Microsoft.Extensions.Configuration.Abstractions (>= 2.2.0 && < 2.3.0).
@ Installing LtiAdvantage in AdvantagePlatform finished (4.57 sec)
[Notification][Install] Install failed (project: AdvantagePlatform, package: LtiAdvantage v2.0.1)
Package restore failed. Rolling back package changes for 'AdvantagePlatform'.
Detected package version outside of dependency constraint: Microsoft.AspNetCore.App 2.2.0 requires Microsoft.Extensions.Configuration (>= 2.2.0 && < 2.3.0) but version Microsoft.Extensions.Configuration 8.0.0 was resol ...  this issue. 
 AdvantagePlatform -> LtiAdvantage 2.0.1 -> Microsoft.Extensions.Configuration.Json 8.0.1 -> Microsoft.Extensions.Configuration.Abstractions (>= 8.0.0) 
 AdvantagePlatform -> Microsoft.AspNetCore.App 2.2.0 -> Microsoft.Extensions.Configuration.Abstractions (>= 2.2.0 && < 2.3.0).