I have a Samsung Galaxy S8 and the following are enabled for me on the PagerDuty app (latest version):
- high-urgency notifications, low-urgency notifications, and all other notifications are enabled (sound)
- high-urgency override system volume is enabled
However, when I have my phone on silent (meaning ringtone, system, notifications, and media volumes are all set to 0), PagerDuty does not override those settings and I do not get an audible notification.
When I test this, I get a push notification but it is silent. If I have vibrate on, then it only vibrates. Only when I have my phone ringtone volume turned on do I get notified audibly.