Q. [Expo ID Registration] It says that the Expo ID I want to use is already in use. A. The Expo ID you entered is already in use by someone else and you cannot register that Expo ID. Please register another Expo ID. Related articles ［Admission Ticket］How can I register additional tickets? [Expo ID Registration] What characters should I use for my Expo ID? [Expo ID Registration] My email address is already registered to an Expo ID so I cannot register a new one. [Expo ID Login] Where can I log in to my Expo ID? [Admission Tickets] If family members, friends, etc. enter at the same time, can they enter with only one phone and one Expo ID?