Outlook for Mac Sync Issues with Exchange Server: Fixes - Resolve NO_PUBKEY and Invalid Signature Errors in Ubuntu-Windows Defender Permission Denied on Ubuntu Files Fix
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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