Two-factor authentication is an optional security feature for Business Manager where you'll be asked to enter a special security code each time you try to access Business Manager from a new computer or mobile phone.

Before you begin

You must have a valid phone number associated with your Facebook account to use this feature.

Enable Two-Factor Authentication

Steps to enable two-factor authentication:

1. Go to Business Settings.
2. Go to Business Info and click Edit.
3. Under Two-Factor Authentication, choose Required for Everyone or Required for Admins only. To turn off two-factor authentication choose Not Required.
4. Click Save.

After you turn on two-factor authentication, we need to be able to remember your computer and browser info so we can recognize it next time you log in. Some browser features block this. If you've turned on private browsing or set up your browser to clear your history every time it closes, you might have to enter a code every time you log in. If you use a third-party app to manage your Page or ad account that are linked to your business, we'll request that you enter a security code the next time you sign in from the app.

If you've turned on two-factor authentication and are being prompted to enter a code for security purposes, you can generate a code from your mobile device to authenticate yourself.

* Nguồn: Facebook