Hi,
on my fairphone 3 it works (old eOS version) : it switches on 1 minute before alarm time, and then can sound the alarm.
then I did some OS upgrade, and it still works, but I can’t find the control anymore… pretty strange. I would like to find it though, to use on other phones.
some info explaining that it is not easy but sometimes possible.
https://www.gearrice.com/update/how-to-make-the-alarm-sound-with-the-mobile-turned-off/
Then I guess that if it can work, the eOS could make it available to configure, right ? any clues ?..
by the way, I just saw that it has been fixed for newer versions of eOS Alarm doesn't work when FP3 is switched off --- after /e/ upgrade - #5 by Ceddev