OneDrive Sync Error 404 Not Found: Causes and Fixes - OneDrive Connection Refused Error 0x8004de40 Guide-Fix Chrome Profile Permission Denied Error on Ubuntu
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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Chrome Profile 404 Not Found: Delete and Restore Profile