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Fix OneDrive Error 0x8004016C: Files Missing and Uploads Failing
Question details
The user is experiencing a major OneDrive synchronization issue accompanied by error 0x8004016C, resulting in missing files, failed uploads, and an inability to sign into the desktop client.
- Product
- Microsoft OneDrive
- Device & OS
- not provided
- Scenario
- Attempting to sync, upload, or access files in OneDrive and logging into the desktop application.
- Observed behavior
- OneDrive displays error 0x8004016C. Files are missing on both the web and desktop versions, uploads fail entirely, and the desktop client cannot sign back in after disconnecting.
Verify whether the issue occurs only on your local computer or also on the OneDrive website, as web-based failures indicate an account-level issue rather than a local application error.
Contact Microsoft Support for Account-Level Diagnostics
Because the issue persists on the OneDrive web version, it indicates an account-specific or server-side problem that requires Microsoft's intervention to restore the corrupted library.
When files are missing and uploads fail on both the desktop application and the web interface (onedrive.live.com), the issue is not isolated to your local PC. Error 0x8004016C in this context points to a corrupted cloud library or a back-end account malfunction. Local repairs will not resolve server-side file disappearance.
Navigate to the OneDrive web portal and sign in with your Microsoft account to confirm that files are still missing online.
Take a screenshot of the error message 0x8004016C and any specific library sync failures mentioned by the client.
Go to the Microsoft Support page, select OneDrive, and submit a support ticket explaining that error 0x8004016C is occurring on both the web and desktop clients.
Perform a Quick Repair of Microsoft 365
Repairing your Microsoft 365 installation can resolve underlying desktop client issues that prevent the OneDrive app from signing in properly.
Switch to WPS Office for Reliable Cloud Document Management
If OneDrive and Microsoft 365 keep giving you persistent sync errors like 0x8004016C, consider switching to WPS Office. It is a free, lightweight alternative that comes with its own stable WPS Cloud, ensuring your files are safely backed up and accessible across all devices without frustrating sync failures.
- 1. Download WPS Office: Visit the official WPS website and download the free installation package for your operating system.
- 2. Activate WPS Cloud: Sign in with your email or social account to instantly activate your free WPS Cloud storage.
- 3. Sync Documents: Simply drag and drop your local files into WPS Office to securely back them up to the cloud.
Frequently Asked Questions
What causes OneDrive Error 0x8004016C?
Error 0x8004016C typically indicates a corruption issue or account-level synchronization failure where OneDrive libraries cannot be reached. When this happens on both web and desktop, it points to a server-side account error.
How do I know if my OneDrive issue is a local or account problem?
Try accessing your files via the OneDrive website. If the files are missing or uploads fail on the web version as well, the problem lies with your Microsoft account or the cloud servers, not your local PC.
Will resetting OneDrive fix error 0x8004016C?
Resetting the desktop app clears local sync data, which helps with app glitches. However, if the web version is also malfunctioning and files are missing online, a local reset will not resolve the issue. You must contact Microsoft Support for account diagnostics.
