Thank you for reaching out. When you open your alarm is the switch for alarm sound turned on? Have you been able to test your device while in safe mode? You can put your device in safe mode by doing the following.
Press and hold the power button until power off, restart, and emergency mode show on screen
Tap and hold on the power off option until it changes to safe mode, then tap on safe mode
The phone will then reboot into safe mode. You will be able to check that it is by a grey transparent box in the bottom left of the screen that says safe mode.