Got a refurbished s10e. The app icon badges were working on day 1 but have since stopped. I tried the standard troubleshooting - turning the app icon badge notification switches on and off, for the phone as a whole and for each app individually, then rebooted the phone. Also talked to Samsung chat associate who had me clear the phone cache. Neither worked. Her next suggestion was to take it to a repair center. I just bought the phone.