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Fix OneDrive Sync Error 'Version Mismatch' on Windows 10 - How to Fix Remote Desktop 504 Gateway Timeout Error-Resolve Windows Defender Update Server Not Reachable

Updated 2026-06-14 01:19:12macos-help
Fix OneDrive Sync Error 'Version Mismatch' on Windows 10 - How to Fix Remote Desktop 504 Gateway Timeout Error-Resolve Windows Defender Update Server Not Reachable
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.