A.
It is necessary to download an application for one-time password authentication, which is a more difficult operation than setting up biometric authentication, passcode authentication, etc. If you have a device with a screen unlock function, we recommend that you use biometric authentication or passcode authentication instead of one-time password authentication.
https://www.expo2025.or.jp/wp/wp-content/themes/expo2025orjp_2022/assets/pdf/tickets-index/id_registration_manual_en.pdf
https://www.expo2025.or.jp/wp/wp-content/themes/expo2025orjp_2022/assets/pdf/tickets-index/id_registration_manual_en.pdf