@@ -30,6 +30,37 @@ jobs:
           repository: PowerShell/PowerShellEditorServices
           path: PowerShellEditorServices
 
+      # TODO: Drop this once PowerShellEditorServices can restore again. Its
+      # nuget.config only lists an Azure DevOps feed whose package downloads
+      # return 401 (Unauthorized) to anonymous clients such as GitHub runners,
+      # so restoring the .NET reference packs fails before any tests run. Add
+      # nuget.org and map the reference packs to it (otherwise NuGet still
+      # downloads them from the feed that 401s).
+      - name: Add nuget.org for the PowerShellEditorServices reference packs
+        shell: pwsh
+        run: |
+          $config = @(
+            '<?xml version="1.0" encoding="utf-8"?>'
+            '<configuration>'
+            '  <packageSources>'
+            '    <clear />'
+            '    <add key="PowerShellCore_PublicPackages" value="https://pkgs.dev.azure.com/powershell/PowerShell/_packaging/powershell/nuget/v3/index.json" />'
+            '    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />'
+            '  </packageSources>'
+            '  <packageSourceMapping>'
+            '    <packageSource key="nuget.org">'
+            '      <package pattern="Microsoft.NETCore.App.*" />'
+            '      <package pattern="Microsoft.AspNetCore.App.*" />'
+            '      <package pattern="Microsoft.WindowsDesktop.App.*" />'
+            '    </packageSource>'
+            '    <packageSource key="PowerShellCore_PublicPackages">'
+            '      <package pattern="*" />'
+            '    </packageSource>'
+            '  </packageSourceMapping>'
+            '</configuration>'
+          )
+          Set-Content -Path PowerShellEditorServices/nuget.config -Value $config
+
       - name: Checkout vscode-powershell
         uses: actions/checkout@v7
         with: