If the message "The one-time password you entered is incorrect." is displayed, it is possible that you entered the wrong one-time password. The one-time password is refreshed after a certain time, so please enter the newest one-time password.
For detailed instructions, see the section "2.2-C: Authentication by App" of the Expo ID Registration Manual.

ExpoID Registration Manual:

https://www.expo2025.or.jp/wp/wp-content/themes/expo2025orjp_2022/assets/pdf/tickets-index/id_registration_manual_en.pdf