Dotnet command failed with non-zero exit code on the following projects : - tfs

Question

I am trying to build on TFS an API which contains several projects in dotnet.core3.1
When I run the dotnet build Api.sln command on TFS here is the result
[error] Dotnet command failed with non-zero exit code on the following projects: D: \ TFS \ Agent01 \ _work \ 18 \ s \ PMTApi.sln
Context:
TFS 2017
Dotnet Core 3.1 projects
Source code management on TFS git
Agents unable to connect to the outside (internet)
The dependency imports are done from a private server thanks to the NuGet.Config file set up to redirect the dependency imports not on the https://api.nuget.org/v3/index.json server but well on that of our private company.
Explanation:
On the TFS git source manager, the PMTApi.sln project contains 7 .csproj files
But in the PMTApi.sln file there are only 4 .csproj which are included
Local result:
Is good dotnet build completes the 5 successful projects.
Result on TFS:
Not good.
[error] Dotnet command failed with non-zero exit code on the following projects: D: \ TFS \ Agent01 \ _work \ 18 \ s \ PMTApi.sln
Observation:
I have the impression that TFS is based on all the .csproj files from the TFS git source manager and not from PMTApi.sln
Conclusion the projects which are not referenced in PMTApi.sln still try to restore the dependencies which causes the top error.
Test:
I tried to exclude these 3 .csproj projects in my NuGet.Config file like this, but it doesn't work
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<packageSources>
<add key="XXX NuGet Packages" value="http://privateServer/nuget" />
</packageSources>
<ItemGroup>
<ProjectReference Exclude="..\folderName1\projectName1.csproj" />
<ProjectReference Exclude="..\folderName2\projectName2.csproj" />
<ProjectReference Exclude="..\folderName3\projectName3.csproj" />
</ItemGroup>
</configuration>
Do you have any ideas for a successful dotnet build task?
The construction:
TFS Return:
Local configuration:
1- here you have to right click on the solution
2- manage package Nuget for solution
3- add the url of your private server
4- and uncheck the server of api.NuGet.org
for my case I also uncheck the visual studio packages

Answer 1

You should specify the csproj file(s) to use in the Project(s) argument, not sln file. Check the description of this argument:
The path to the csproj file(s) to use. You can use wildcards (e.g.
**/*.csproj for all .csproj files in all subfolders). This field follows glob pattern, and is run against root of the repository at all
times irrespective of Working Directory.
https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/build/dotnet-core-cli?view=azure-devops