Andrew, you're wrong. I have a 20+ which I just got this weekend and the exact same thing is occuring with mine. I've slept through two alarms now with my phone set to silent. If I want the alarm to go off, I have to have all volumes up, including the ring, notification, and "system" volumes. I have "do not disturb" set but sometimes you just want to have complete silence through the night.
There must be a glitch in the actual software because I have done numerous attempts with the volumes, different ring tones, factory ring tones, and multiple alarms set. The only way to hear the audible ring tone is to have the "system volume" up. I have adjusted the vilume in the clock app too for the alarm. Nothing changes.
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