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How to Fix Rust Cargo Build Failed with Exit Code 101 - Fix Defender Authentication Failed on Windows 10/11-Troubleshooting Microsoft Store Startup Error 0x80073cf0

2026-06-13 18:03:11developer-tools
How to Fix Rust Cargo Build Failed with Exit Code 101 - Fix Defender Authentication Failed on Windows 10/11-Troubleshooting Microsoft Store Startup Error 0x80073cf0

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.