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Fix Windows Defender Authentication Failed Group Policy Error - Stop Windows Update from Stalling at Checking for Updates-Windows 11 Microsoft Store 404 Troubleshooting Guide

2026-06-13 14:45:04developer-tools
Fix Windows Defender Authentication Failed Group Policy Error - Stop Windows Update from Stalling at Checking for Updates-Windows 11 Microsoft Store 404 Troubleshooting Guide

Final checklist

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