Click on ‘My Ticket’ from the menu at the bottom of the top page of the admission ticket purchase website, log in from the login screen and My Ticket will be displayed. If you purchased your ticket from a website other than the official website, you will be able to check it in the same way after linking your ticket ID to your Expo ID (additional registration).

https://ticket.expo2025.or.jp/en/faq/?_gl=1*1iog4st*_gcl_au*MjAxODMyNDY4Ny4xNzI1NTgxOTgz