Outlook Dependency Conflict Troubleshooting Checklist - Resolve Windows Defender and Microsoft 365 Sync Errors-Fix Microsoft Teams Sync Issues with Outlook Calendar
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.