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 [Expo ID Registration] What characters should I use for my Expo ID? [Expo ID Registration] Is there a specific format for the password? [Expo ID]Can I change my ExpoID? [Expo ID Login] Where can I log in to my Expo ID? [Admission Ticket]How can I register additional tickets?