It is not possible to use "Biometric Authentication, Passcode Authentication, etc." when using two devices, such as a computer and a smartphone.
You will need to set up either "Authentication by email" or "Authentication by app".

For more information, see section "3. For Those Who Log in with Two or More Smartphones or PCs" in the Expo ID Registration Manual below.

Expo ID Registration manual:

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