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Fix 'Windows Defender File Locked Cannot Access' Error - How to Fix Update Error 0x800f0831 with Metered Network-Resolve Permission Denied Errors During File Sync

2026-06-13 14:13:24office-tools
Fix 'Windows Defender File Locked Cannot Access' Error - How to Fix Update Error 0x800f0831 with Metered Network-Resolve Permission Denied Errors During File Sync

Final checklist

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