Why is my alarm not working on iPhone?

Why is my alarm not working on iPhone?
I’ve been relying on my iPhone alarm to wake me up every day, but recently, it seems to have stopped working correctly. I set the alarm like I always do, but it just doesn’t go off at all. It’s becoming really frustrating because I’ve missed important meetings and appointments due to this issue. I’ve checked the volume, made sure the ringer is on, and even tried setting multiple alarms, but nothing seems to help. I haven’t updated my phone or changed any settings that I can recall. I’m at a loss for why this is happening and need to figure out what could be causing my iPhone alarm to not work as expected.