OneDrive not syncing

Since deleting the OneDrive cached credential on Mac did not help, use the next supported recovery path:

1. Unlink the Mac from OneDrive:
   • Select the OneDrive cloud icon in the menu bar.
   • Open Help & Settings > Preferences.
   • Open the Account tab.
   • Select Unlink this Mac.
2. Clear cached sign-in credentials again using the alternate supported method:
   • Open Keychain Access from Spotlight or Utilities.
   • If keychains are not visible, choose Window > Keychain Access.
   • Choose File > Delete Keychain [OneDrive/Office/MS].
   • Select Delete References.
3. If the error is specifically "You're already syncing this account", also remove the Mac-side OneDrive plist files:
   • Go to /Users/<username>/Library/Group Containers/
   • Delete UBF8T346G9.OneDriveSyncClientSuite.plist
   • Delete UBF8T346G9.OfficeOneDriveSyncIntegration.plist
   • Restart OneDrive.
4. Sign in again:
   • Start OneDrive.
   • Sign in when prompted.
   • If OneDrive says a folder already exists, select Use this folder.
5. If OneDrive is failing on one specific file, use the supported file-level recovery step:
   • Close OneDrive.
   • Move the problem file out of OneDrive.
   • Start OneDrive again and wait until status shows Up to date.
   • Copy the file back into OneDrive.
6. If OneDrive still cannot be recovered, uninstall and reinstall OneDrive. This does not remove files or data; files remain available in OneDrive online.

References:

• Fix OneDrive sync problems on Mac
• Unlink and re-link OneDrive
• What do the OneDrive error codes mean?
• Troubleshoot OneDrive error: "This file can’t be synced"
• Clear OneDrive cached credentials