Q. [One Time Password Authentication for Expo ID] Is it possible to authenticate login by one-time password notification via social media? A. One-time password notification via social media is not available. Related articles [One Time Password Authentication for Expo ID] Is it possible to authenticate login with one-time password notification by email? [Identification of Expo ID] I want to use biometric authentication for identity verification. [Expo ID Login] What is an email address confirmation email? [One Time Password Authentication for Expo ID] How do I log in and set up "Authentication by Email" for the first time? [One Time Password Authentication for Expo ID] I am asked for a one-time password by email every time I log in.