My Galaxy S7 (G930F) phone has a problem where the alarm does not work if the phone is on vibrate or mute. It results in missed alarms and made me late for work. (On more than one occasion.) I troubleshoot the problem and end up solving it. This solution should be identical for the S7 Edge and may be the same for other Samsung phones. Jump to 12m 40s if you want to go right to the solution.