An authenticator app is a mobile application that generates temporary, unique codes for two-factor authentication (2FA).
Here is how it works: When you log into an account that has 2FA enabled, you enter your password plus a 6-digit code from the app that changes every 30 seconds. After you type in your password, you'll be prompted to enter this 6-digit number from your authenticator app to prove it's really you trying to log in. It's like having two locks on your door - your password is one key, and the app code is the second.
Even if someone figures out your password, they can't get into your account because they don't have your phone with the special codes. It's much safer than getting codes sent to your phone via text message, which can be stolen. The most common authenticator apps are Google Authenticator and Microsoft Authenticator, and they're free to download.
The PCI DSS support team cannot support the setup process for MFA for security reasons.
You will find below some helpful links to assist with setting this up:
Automatically fill in one-time verification codes on iPhone - Apple Support
Set up temporary verification codes in the Microsoft Authenticator app - Microsoft Support
Get verification codes with Google Authenticator - Android - Google Account Help
Add a New Two Factor Authentication (2FA) Account Token in the Authy App – Authy
Use 1Password as an authenticator for sites with two-factor authentication