Answer:
You can use any Authenticator App that generates temporary codes based on time-based one-time passwords (TOTP). There are lots of free and paid Authenticator Apps to choose from. Widely-used options include Google Authenticator, Microsoft Authenticator, and Authy.
We’ve been made aware of an issue which is affecting some Apple users when using Google Authenticator. If this is the case, please try an alternative App or MFA method.
We highly recommend that users set up a PIN or biometric requirement on their mobile device.