If you are logging in from a new device, e.g. after changing your smartphone model, you will need to reset your identity verification.
First, enter your Expo ID and password on the login page, then reset your identity verification settings by clicking "Click here to reset your Identity Verification Methods" on the "Identity Verification" page.
Then, enter your Expo ID and password on the login page again and reset your identity verification settings.

For more information, please refer to section 3 "Using a Different Smartphone Model" of the Expo ID Problem Solving Manual below.

ExpoID Problem Solving Manual:

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