Q1) What is SMS authentication on 2FA service? [ ANSWER ]
Q2) What is Verification Code / One-Time Password (OTP)? [ ANSWER ]
Q3) What is Receive Notifications for Verification on 2FA service? [ ANSWER ]
Q4) How to change authentication method? [ ANSWER ]
Q5) How to change my mobile number for SMS authentication? [ ANSWER ]
Q6) How to activate my new mobile device for "Receive Notifications for Verification" authentication OR "Verification Code" authentication?
Q7) How to deactivate "Microsoft Authenticator" application on my obsoleted mobile device? [ ANSWER ]
Q8) How many mobile devices I can activate for "Microsoft Authenticator" application? [ ANSWER ]
Q9) How to remove my mobile number from Student Two Factor Authentication Service Portal? [ ANSWER ]
Q10) How can I do if I encounter "Server Error" Page during registration? [ ANSWER ]
Q11) I am using "SMS" for two factor authentication. I received One-time Password from different phone number display, even it came from "123456" during authentication, is it correct? [ ANSWER ]
Q12) I am using "Verification Code" for two factor authentication. The password was changed every 30 seconds. Can it extend the period for changes? [ ANSWER ]
Q13) How can I test my authentication method whether is workable or not? [ ANSWER ]
Q14) How can I resolve if I lost my mobile device or remove "Microsoft Authenticator" application? [ ANSWER ]
Q15) Will my mobile number be used for other purposes? [ ANSWER ]
Q16) I am using "SMS" for two factor authentication. I will travel abroad and cannot receive SMS through my Hong Kong mobile number. What should I do so that I can use two factor authentication overseas? [ ANSWER ]
Q17) What is App Password? [ ANSWER ]
Q18) I have already setup App Password but I still cannot login. What should I do? [ ANSWER ]
Q19) Why I cannot login to some system after I reset my 2FA? [ ANSWER ]
Q20) The system fail to authenticate when I attempted to authenticate many times during registration or reset 2FA. What can I do? [ ANSWER ]
Q21) Why Two Factor Authentication Service Portal authentication did not have response when I activate my new mobile device for "Microsoft Authenticator" application? [ ANSWER ]
Q22) Why I cannot find "2FA Status" tab in CNA Services Portal after login?[ ANSWER ]
Q23) I registered on Two Factor Authentication Service Portal. Why my account did not have 2FA feature when I login VTC applications?
Q24) Why I cannot scan QR code successfully on Two Factor Authentication Service Portal?[ ANSWER ]
Q25) How to register Two Factor Authentication from non-VTC network?[ ANSWER ]
Q26) Three distinct states of Two Factor Authentication[ ANSWER ]
Q27) What is my 2FA status after I registered 2FA on Microsoft Authentication Portal?[ ANSWER ]
Q28) Why I cannot login to CNA Portal under non-VTC network?[ ANSWER ]
Q29) I have already registered MFA but I cannot receive SMS one-time password or notifications from mobile apps when I login VTC applications. What should I do?[ ANSWER ]
Q30) How to disable MFA service for my account after registration?[ ANSWER ]