Fix Command Prompt Blank White Screen with No Text - Fix Outlook 404 Not Found Error on Windows 10-Teams Authentication Failed Due to Proxy – Troubleshooting

Updated 2026-06-14 05:37:42office-tools
Fix Command Prompt Blank White Screen with No Text - Fix Outlook 404 Not Found Error on Windows 10-Teams Authentication Failed Due to Proxy – Troubleshooting
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.