You can only add a third-party authentication app or other two-factor authentication method if you already have access to your Facebook account. If you can't access your Facebook account, …

When two-factor authentication is turned on, you'll be asked to enter a special login code or confirm your login attempt each time someone tries to access your Facebook from a browser …

Log into Facebook to start sharing and connecting with your friends, family, and people you know.

If you can't access your Facebook account, you can learn how to try and recover it. When you turn on two-factor authentication, you're asked to choose either a security key, text message …

With a security code from a third party app you've associated with your Facebook account. You can approve your login attempt from a device we already recognize.

Learn how you can use an authentication app for two-factor authentication on Facebook.

A third-party authentication app (such as Duo Mobile or Google Authenticator) can be used to generate login codes that help us confirm it's you when you log in from a new device for the …

If you can’t receive your two-factor authentication codes by phone or authentication app, there are still things you can do.

You can only add a third-party authentication app or other two-factor authentication method if you already have access to your Facebook account. If you can't access your Facebook account, …

Security Tips and Features Use our security features like login alerts and approvals, and review and update your Security Settings at any time.