As of May 29, 2024 all HCC Accounts will be required to enroll in multi-factor authentication.
Microsoft Authenticator is the recommended method for providing multi-factor authentication to your HCC Account
Authenticator is an app for your smartphone and available free of charge for both iPhone and Android
Apple: Microsoft Authenticator on the App Store (apple.com)
Android: Microsoft Authenticator - Apps on Google Play
Not only can you use Microsoft Authenticator for your HCC account, but you can use it for multiple accounts. You can also use Authenticator as a password manager.
Remember to transfer your MFA account to your new phone before getting rid of your old one.
For more on implementation of Microsoft Authenticator for your HCC Account see the Microsoft Authenticator Guide - Google Docs