How to Facebook two factor authentication enable || Facebook two step verification in mobile Bangla
How do I use an authentication app for two-factor authentication on Facebook?
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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, you can try recovering it.
When you turn on two-factor authentication, you're asked to choose either a security key, text message (SMS) codes or a third-party authentication app as your primary security method. A third-party authentication app (such as Google Authenticator or LastPass) can be used to generate login codes that help us confirm it's you when you log in from a new device for the first time.
To use a third-party authentication app for login codes.
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1
Install a third-party authentication app on your device. It's best to install the app on the device you normally use to access Facebook.
2
Tap in the top right of Facebook.
3
Scroll down and tap Settings, then tap Security and login.
4
Scroll down and tap Use two-factor authentication.
5
Tap Authenticatio then tap Add a new app.