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Fix PowerShell Profile Causing Blank Screen at Startup - How to Fix Windows Defender Authentication Failed Error-Troubleshoot Windows Security Connection and Permission Errors

Updated 2026-06-13 20:58:33office-tools
Fix PowerShell Profile Causing Blank Screen at Startup - How to Fix Windows Defender Authentication Failed Error-Troubleshoot Windows Security Connection and Permission Errors
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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