Fix OneDrive 502 Bad Gateway Error from Proxy Settings - How to Resolve Windows Update Invalid Configuration in Windows 10-Step-by-Step: Setup Windows Defender Network Protection for Business
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.