Try setting long paths.

azure-pipelines.yml

@@ -74,6 +74,8 @@ jobs:
           versionSpec: '$(python.version)'
           architecture: 'x64'
 
+      - script: powershell Set-ItemProperty -Path HKLM:\SYSTEM\CurrentControlSet\Control\FileSystem -Name LongPathsEnabled -Value 1
+        displayName: 'set long path'
       - script: 'python -m pip install -U pip'
         displayName: 'upgrade pip'
       - script: 'pip install --upgrade -e ".[test]"'