Fix Outlook Sync Not Working After Reset - How to Fix Teams Self-Signed Certificate Error-Troubleshooting Error 0x80070643 with Windows Defender on Mac

Updated 2026-06-14 01:46:29cloud-software
Fix Outlook Sync Not Working After Reset - How to Fix Teams Self-Signed Certificate Error-Troubleshooting Error 0x80070643 with Windows Defender on Mac
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.