Reply To: Serial number is missing Home › Forums › Synology Alarm Clock › Serial number is missing › Reply To: Serial number is missing 27.02.2022 at 16:03 #47678 Sergei ParfenovKeymaster Hello Unfortunately, I have no idea how to get the alarmclock to work with two factor authentication. if two factor authentication is important to you, you can uninstall the program and request a refund for the license in paypal. Sergei