Recently, a few users have reported that OneDrive is not syncing with their computer and the icon has disappeared from the tray.
To fix the disappeared icon, click the OneDrive folder in File Explorer. To force a sync, login to the Office 365 web portal and click the Sync Now button.
If these steps don’t work, contact ITS at firstname.lastname@example.org or ex. 3333 for troubleshooting.