Hey Siri not working?
I’ve tried turning off hey Siri then turning it back on multiple times but it never gives the options to set it up I’ve even tried turning on and off my iPhone what’s happening?
Find out which devices support "Hey Siri". (If you haven't used Hey Siri before, you might want to check using "Hey Siri" is possible with your device
Otherwise, you'll want to check out : If "Hey Siri" isn't working on your iPhone or iPad – Apple Support