Any IOS (Apple) versions?
New Traveler EligibilityDecember 2023 - Travelers from Visa Waiver Program countries (ESTA users) with a prior United States entry will be eligible to use MPC.
https://www.cbp.gov/travel/us-citizens/mobile-passport-control#:~:text=New%20Traveler%20Eligibility,to%20use%20MPC.