Fix Outlook Data File Sync Error: Cannot Access - Troubleshoot Windows Terminal Backup Issues-Fix Windows Security Error 0x80072efd (Proxy Issue)

Updated 2026-06-18 06:30:37backup-recovery
Fix Outlook Data File Sync Error: Cannot Access - Troubleshoot Windows Terminal Backup Issues-Fix Windows Security Error 0x80072efd (Proxy Issue)
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.