DUO Security provides Multi Factor Authentication (MFA) service to protect legitimate login to some systems. You could login self-service portal to add/configure your device(s). Or you could generate a one-time bypass code in case your device(s) is not around. For details, please visit https://www.eduhk.hk/ocio/mfa-duo.
Should you need any assistance during the process, please contact OCIO IT Help Desk hotline at 2948-6601 or email to firstname.lastname@example.org.