After re-installing it will start appearing in Taskbar window and it will fix OneDrive sync issue.Double click on 'OneDrive.exe' icon to re-install Microsoft OneDrive, But make sure you don't have any unsaved or not synced files on your Desktop OneDrive app, otherwise you may loose your non synced files.Enter '%localappdata%\Microsoft\OneDrive\ ' and click on 'OK' button OR go to 'C:\Users\logged_in_user\AppData\Local\Microsoft\OneDrive' folder.Open Run window from start menu or click on Windows + R.
How to Re-install Microsoft OneDrive and fix Syncing issue on Windows 10: Please see the steps below to re-install it. If 'Microsoft OneDrive' application is missing from the list, then your OneDrive application needs to be re-installed. Now, check it will start appearing on Taskbar.
