If you experience trouble synchronizing OneDrive libraries, you may need to update the sync client. To update to the latest version, go to https://support.office.microsoft.com/en-us/article/update-the-onedrive-for-business-sync-app-49771c73-e7ad-4d26-bff1-50bb12a83817?ui=en-US&rs=en-US&ad=US.