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Azure DevOps NuGet error

When trying to restore a NuGet package inside an Azure DevOps Build it failed with the following error message:

2019-11-13T09:17:59.8686867Z ##[section]Starting: NuGet restore

2019-11-13T09:17:59.8813825Z ==============================================================================

2019-11-13T09:17:59.8813825Z Task         : NuGet Installer

2019-11-13T09:17:59.8813825Z Description  : Installs or restores missing NuGet packages

2019-11-13T09:17:59.8813825Z Version      : 0.2.31

2019-11-13T09:17:59.8813825Z Author       : Microsoft Corporation

2019-11-13T09:17:59.8813825Z Help         : [More Information](https://go.microsoft.com/fwlink/?LinkID=613747)

2019-11-13T09:17:59.8813825Z ==============================================================================

2019-11-13T09:18:01.6050815Z [command]C:\Windows\system32\chcp.com 65001

2019-11-13T09:18:01.6050815Z Active code page: 65001

2019-11-13T09:18:01.6070347Z Detected NuGet version 3.3.0.212 / 3.3.0

2019-11-13T09:18:01.6080113Z SYSTEMVSSCONNECTION exists true

2019-11-13T09:18:01.6080113Z [command]D:\b\4\agent\_work\_tasks\NuGetInstaller_333b11bd-d341-40d9-afcf-b32d5ce6f23b\0.2.31\node_modules\nuget-task-common\NuGet\3.3.0\NuGet.exe restore -NonInteractive D:\b\4\agent\_work\59\s\MestbankPortaal.sln -ConfigFile D:\b\4\agent\_work\59\s\nuget.config

2019-11-13T09:18:02.1119369Z MSBuild auto-detection: using msbuild version '14.0' from 'C:\Program Files (x86)\MSBuild\14.0\bin'.

2019-11-13T09:18:02.4713257Z Feeds used:

2019-11-13T09:18:02.4713257Z   C:\Users\tfsservice\AppData\Local\NuGet\Cache

2019-11-13T09:18:02.4713257Z   C:\Users\tfsservice\.nuget\packages\

2019-11-13T09:18:02.4713257Z   http://tfs:8080/tfs/DefaultCollection/_packaging/Feed/nuget/v3/index.json

2019-11-13T09:18:02.4713257Z   C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\

2019-11-13T09:18:02.4713257Z

2019-11-13T09:18:02.4986705Z Restoring NuGet package IAM.Security.2.6.1.

2019-11-13T09:18:45.2347882Z WARNING: Unable to find version '2.6.1' of package 'IAM.Security'.

2019-11-13T09:18:45.2572523Z Unable to find version '2.6.1' of package 'IAM.Security'.

2019-11-13T09:18:45.2816698Z ##[error]Error: D:\b\4\agent\_work\_tasks\NuGetInstaller_333b11bd-d341-40d9-afcf-b32d5ce6f23b\0.2.31\node_modules\nuget-task-common\NuGet\3.3.0\NuGet.exe failed with return code: 1

2019-11-13T09:18:45.2816698Z ##[error]Packages failed to install

2019-11-13T09:18:45.2855766Z ##[section]Finishing: NuGet restore

This was a package that was recently added to our private Azure Artifacts feed, but I was able to restore it without any problem on my local machine.

Eventually I found out that I could solve the problem by increasing the NuGet version used by the build process to version 4:

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