How to Resolve Outlook Invalid Configuration on Windows 10 - Teams Sign-In Error CAA2000C: Causes and Fixes-Resolve 504 Error with Firewall Adjustments for Windows Update
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.