The Account Authentication page is where you can add two-factor authentication (2FA) using a time-based one time password (TOTP). 2FA is important for securing your account and making it harder for the account to be compromised.
To enable 2FA account authentication you can go to the "Preferences & Logout" tab and then click on the "Register / Manage" button next to the "Login Authentication" text.
See: Removing an Authenticator
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