A.
If you want to verify your identity on your iPhone or iPad, you must agree to the latest iCloud Terms of Service.
If you see the "New iCloud Terms of Service" menu at the top of the Settings app on your iPhone, please go there to agree to the new Terms of Service. You can also set up identity verification using the One Time Password Authentication (app) or One Time Password Authentication (email) in the Identity Verification Methods.
The Expo ID Registration Manual on the Expo Ticket Information Website contains detailed instructions for obtaining your Expo ID, so please check the link below before registering.