
Fix OneDrive Sync Error 0x8004de40 – Authentication Failure
You're working on a file when OneDrive pops up an error: "Authentication failed – Error c...
Software troubleshooting desk

You're working on a file when OneDrive pops up an error: "Authentication failed – Error c...

When you see error code 0x80070002 in Windows Terminal, it usually means the sys...

If you see a BitLocker authentication failed error during startup, Windows cannot unlock the driv...

When Outlook acts up—connection errors, startup failures, or sync problems—the built-in log files...

You open OneDrive and see a sync error: “Version mismatch.” This usually means the OneDrive app o...

You boot into Safe Mode to run a malware scan, but Windows Defender shows nothing—just a blank wh...