Hello there,
well I think I found a bug with the android application of Prey
When I activate the power button (Shield OFF Button) , looks like it doesn’t work
I tried with my zenfone 3 max and a motorola moto 3 and works great but on my Xiaomi Redmi 5 plus (android 7.1.2, MIUI Global 9.6.2.0) it doesnt work, im able to turn off my phone easily without prey asking me the pin.
EDIT: it works when the phone is unlocked but when it’s locked I can use the Off Button anytime