UniSA supports Multi-Factor Authentication using the Okta Verify mobile app only.
If you do not have a mobile phone, please contact the IT Help Desk.
NOTE: It is recommended to complete the initial MFA registration process from your computer web browser as it has a more user friendly interface, and you need to scan a QR Code with your phone during the setup.
Or for step by step instructions (including screenshots) see the How to register for Multi-factor Authentication via the Okta Verify App page.
The first thing you should do is contact the IT Help Desk and let them know. They can reset your factor to allow you to re-register a new number or in the case of a lost phone, they will disable the ability for your old phone to be available for MFA. Once you are setup with a new phone you can register it for MFA using the steps in this FAQ.