After you enable 2FA for Twitter you will need both your password and your phone to log in to your account. When you log in to Twitter.com, you will receive a text message with a login code (SMS users with a supported carrier), or a push notification (iOS and Android users).
1. Go to your Security and Privacy Settings on Twitter.com and select the option to “send login verification requests to my phone.”
3. When prompted, click “Okay, send me a message.”
4. If you receive the verification message, click Yes. (Note: you’ll have to enter your password.)
5. All set! Your settings should be saved.
Now, when you log in to your account on twitter.com, Twitter for iOS, Twitter for Android, or mobile.twitter.com, a six-digit login code will be sent via text message to your phone. Enter the code when prompted to access your account. Note: If you are currently logged in to Twitter on the web or on your mobile device (including any applications), you will not be logged out of any existing sessions once login verification is enabled. If you do choose to log out of your mobile device or other applications, you will need to log back in using a temporary password instead of your usual username and password combination.
For more information visit: https://support.twitter.com/articles/20170388
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