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Fix 'Windows Security Cannot Connect to Microsoft Defender' Error - How to Resolve PowerShell Token Expired 401-Resolve Windows Store 0x80073cf9 Sync Error

2026-06-13 16:27:56
Fix 'Windows Security Cannot Connect to Microsoft Defender' Error - How to Resolve PowerShell Token Expired 401-Resolve Windows Store 0x80073cf9 Sync Error

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.