You need an authenticator app to get the 6-digit codes you must enter when logging in. This is not an SMS and not an email: the codes appear in an app on your smartphone and automatically change every few seconds.

You can use any app that supports TOTP codes. Common apps include:

• Microsoft Authenticator

• Google Authenticator

• Authy

• 1Password / Bitwarden (password managers with TOTP)

Which one should I choose?

• Want the simplest option? Choose Google Authenticator or Microsoft Authenticator.

• Want something that’s often easier to move to a new phone? Choose Authy or a password manager such as 1Password or Bitwarden.

How do I install such an app?

• Open the App Store (iPhone) or Google Play Store (Android).

• Search for the app name (e.g., “Microsoft Authenticator”).

• Tap Download / Install.

• Open the app. You’ll usually see a + or Add account. You’ll use that to scan the QR code later.