I am trying to retrieve a custom NuGet package that I have pushed into a Azure DevOps Artifacts (project)feed.

But the NuGetCommand@2 fails with error:

NU1301: Unable to load the service index for source https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json.

My build yaml file has got following steps:

steps:
- task: NuGetToolInstaller@1
# Required for custom access to Artifacts
- task: PowerShell@2
  displayName: "Install Artifacts Provider"
  inputs:
    targetType: 'inline'
    script: |
      Write-Host "Install Artifacts Provider"
      Invoke-Expression "& { $(irm https://aka.ms/install-artifacts-credprovider.ps1) } -AddNetfx"
- task: NuGetAuthenticate@1
- task: NuGetCommand@2
  inputs:
    command: 'restore'
    FeedsToUse: 'select'
    restoreSolution: '$(solution)'
    vstsFeed: [FEED_NAME]

In my nuget.config file I have the following configuration:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <clear />
    <add key="[FEED_NAME]" value="https://pkgs.dev.azure.com/[COMPANY_NAME]/[PROJECT_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json" />
  </packageSources>
  <packageSourceCredentials>
    <[FEED_NAME]%>
      <add key="Username" value="[USER_NAME]" />
      <add key="Password" value="[PAC]" />
    </[FEED_NAME]>
  </packageSourceCredentials>
</configuration>

Under the artifact permissions settings I have given the project build service the collaborator role.

With this setup I get the following messages in the log:

The NuGetAuthenticate step gives this output and is successfull:

Setting up the credential provider to use the identity '[PROJECT_NAME] Build Service ([COMPANY_NAME])' for feeds in your organization/collection starting with:
  https://pkgs.dev.azure.com/[COMPANY_NAME]/
  https://[COMPANY_NAME].pkgs.visualstudio.com/

The NuGetCommand step fails with following log:

Using D:a_tasksNuGetCommand_333b11bd-d341-40d9-afcf-b32d5ce6f23b2.238.1CredentialProviderV2pluginsnetfxCredentialProvider.MicrosoftCredentialProvider.Microsoft.exe as a credential provider plugin.

Feeds used:
    C:Program Filesdotnetlibrary-packs
    https://api.nuget.org/v3/index.json
    https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json


...


[CredentialProvider]Handling 'Request' 'GetAuthenticationCredentials'. Time elapsed in ms: 4 - Payload: {"Uri":"https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json","IsRetry":false,"IsNonInteractive":true,"CanShowDialog":true}
[CredentialProvider]Creating a progress reporter with interval: 00:00:02
[CredentialProvider]Handling auth request, Uri: https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json, IsRetry: False, IsNonInteractive: True, CanShowDialog: True
[CredentialProvider]URI: https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json
[CredentialProvider]VstsBuildTaskServiceEndpointCredentialProvider - This credential provider must be run under the Team Build tasks for NuGet with external endpoint credentials. Appropriate environment variable needs to be set.

...

[CredentialProvider]Skipping NuGetCredentialProvider.CredentialProviders.VstsBuildTaskServiceEndpoint.VstsBuildTaskServiceEndpointCredentialProvider, cannot provide credentials for https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json

...

NU1301: Unable to load the service index for source https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json.

The strange part is that all source URL have removed the project name.
Instead of

https://pkgs.dev.azure.com/[COMPANY_NAME]/[PROJECT_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json

he uses the url without the project name:

https://pkgs.dev.azure.com/[COMPANY_NAME]/_packaging/[FEED_NAME]/nuget/v3/index.json