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Fix Outlook 502 Bad Gateway Error After Update - Troubleshoot OneDrive 0x8004de40 SSL Issue-Outlook Permission Denied: File Locked by Another User

Updated 2026-06-14 22:24:42backup-recovery
Fix Outlook 502 Bad Gateway Error After Update - Troubleshoot OneDrive 0x8004de40 SSL Issue-Outlook Permission Denied: File Locked by Another User
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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