FAQ
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General Qusetions
1. What is Two-factor Authentication (2FA)?
Two-factor Authentication adds a second layer of security to your accounts. Verifying your identity using a second factor to approve authentication requests prevents anyone but you from logging in, even if they know your password.
After inputting your login information, you can select the 2nd factor authentication method. If selected 'Duo Push', you will be asked to respond to a push message. If selected 'Duo Mobile Passcode', you enter a one-time passcode to verify your identity - both can be done via your mobile device.
2. Why do we need Two-factor Authentication (2FA) and who will require to login with Two-factor Authentication (2FA)?
Login credentials are more valuable than ever and are increasingly easy to compromise. Over 90% of breaches today involve compromised usernames and passwords.
Two-factor authentication enhances the security of your account by using a secondary device to verify your identity. This prevents anyone but you from accessing your account, even if they know your password.
Staff who is employed as Full-time, Part-time, Temporary and Tutor employee will be enforced to login the selected web applications with 2FA phase by phase.
3. What is the minimum system version requirement on mobile device, Duo Mobile App and web browser to Support Duo Two-factor Authentication (2FA)?
With reference to Duo’s information on Feb 2025:
Mobile Device OS | Minimum Supported Version (Updated on Feb 2025) |
---|---|
iOS | 16 (Effective 17 Feb, 2025) Click here to get the details and latest supported version. |
Android | 11 (Effective 8 Feb, 2024) Click here to get the details and latest supported version. |
Web Browser | Minimum Supported Version (Updated on May 2024) |
---|---|
Chrome | 38 |
Safari | 9 |
Firefox | 47 |
Edge | 17 |
Internet Explorer | 11 |
Duo Mobile App on Mobile Device | Minimum Supported Version (Updated on Sep 2025) |
---|---|
iOS | 4.85 |
Android | 4.85 |
4. How to check the version of the Duo Mobile app which installed on mobile device?
1. Open the Duo Mobile app on mobile device.
2. Tap the menu icon (usually three lines or dots) in the top corner.
3. Current app version will be displayed at the bottom. If it is below version 4.85, please proceed to upgrade via your device’s app store (i.e. iOS - App Store or Android - Play).
(* For the version 4.85, the minimum mobile device OS requirement is iOS 16 and Android 11.)
5. Is it necessary to input my phone number during enrollment of mobile device if the Duo Mobile App was installed in my mobile phone?
No, it is not necessary to provide your phone number during enrollment. We provide 'Duo Push' response and 'Duo Mobile Passcode' authentication methods which generated by the 'Duo Mobile App' without requiring your phone number.
6. Can I enroll multiple mobile phone or tablet to use Duo Two-factor Authentication (2FA)?
Yes, you can.
7. What should I do if I have changed my mobile phone?
Before disposed or reset your old mobile phone, access the Two-factor Authentication (2FA) website (https://mfa.hkmu.edu.hk), click here, login and then select 'Other options' in the next prompt screen, and then click 'Manage devices' in the menu to add a new mobile phone.
If your old mobile phone was reset to default/disposed/damaged/lost, obtain a 'Bypass Code' in here and then click here, login and then select 'Other options' in the next prompt screen, click 'Bypass Code', input the obtained 'Bypass code', after passed the authentication, click '+' icon to add the new mobile phone. Refer detail steps in the Duo 2FA Mobile Device Management User Guide.
8. Does the Two-factor Authentication (2FA) method - "Duo Push" require internet connection or mobile network connection?
Yes, it will use your mobile data or it requires internet connection if you are select "Duo Push" as the 2FA.
9. Any information will be collected by Duo mobile app if it is installed on the mobile device?
Please refer to Duo's Service Privacy Notice ( https://duo.com/legal/privacy-notice-services) for detail, the information they will collect includes: device information and log data.
10. Can I use Duo Mobile App for Two-factor Authentication with Multiple Accounts?
Yes. if you have multiple accounts, you can also use Duo Mobile App for Two-factor authentication.
11. What should I do if I am no longer working for HKMU?
You can delete the HKMU Two-factor Authentication (2FA) user account record in the Duo Mobile App. Or, if you have no other user account use Duo Mobile App as 2FA, you can uninstall the Duo Mobile App.