For years, Apple forced notifications and alarms to share the same volumes. That is finally changing in iOS 27.

iOS 27 offers new volume controls
Apple introduced new sound & haptics controls during WWDC26. Under the new settings, alarms, timers, notifications, and other sounds no longer have to follow the same volume slider.
People who lowered notification volume could also lower alarm volume without realizing it. An alarm, a timer, and a text message don’t serve the same purpose, yet iPhone users have adjusted them through the same controls for years.