I am building a data logging app that logs the iphone's movement data at 120 hertz and 200 but for some reason its always capped at 100. does anyone know if there a hardware issue or is there a code problem that could be linked to this. made in Xcode.

I want to make a app that indicates that the app is recording in the background using a indicator on the dynamic island or on the top of the phone screen but i can't figure it out on Xcode. Saw a guy do it by making live activities true but can't seem to find that option in background mode in capabilities. any ideas?