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Before you start. An authenticator app on the phone: Google Authenticator, Microsoft Authenticator, Proton Pass or similar.
1

More, Profile, then Two-factor authentication

Tap Set up authenticator app.
2

Scan the code

Scan the QR code with the app, or type the key it shows. Enter the six-digit code the app gives. Confirm & enable.
3

Sign in from now on

You enter your password, then the code from the app. If the phone is lost, the emailed code still signs you in; turn the authenticator off and on again from this page.
Two-factor authentication: the note that emailed codes stay as a fallback, and Set up authenticator app.

Two-factor authentication, with the setup button.

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What You See Next

The page reads “Your authenticator app is on”. Disable authenticator asks for a current code.

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If It Does Not

Related: Two-factor Sign-in.