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Fix Windows Update Token Expired Registry Error - Windows Security App Won't Open After Update: Troubleshooting Guide-Windows Terminal Certificate Validation Troubleshooting

2026-06-13 18:55:04windows-fixes
Fix Windows Update Token Expired Registry Error - Windows Security App Won't Open After Update: Troubleshooting Guide-Windows Terminal Certificate Validation Troubleshooting

Final checklist

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