How do I use an authentication app for two-factor authentication on Instagram?
When you turn on two-factor authentication, you're asked to choose either text message (SMS) codes or a third-party authentication app as your primary security method. 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 first time.
Keep in mind that you have to be logged into Instagram in order to turn on two-factor authentication. Learn more about what to do if you can't log in or if you think your account has been hacked.
To use a third-party authentication app for login codes:
  1. Tap instagram-user-profile or your profile picture in the bottom right to go to your profile.
  2. Tap three lines stacked on top of each other in the top right, then tap a symbol circle gearSettings.
  3. Tap Security, then tap Two-Factor Authentication.
  4. If you haven't already turned two-factor authentication on, tap Get Started.
  5. Tap toggle next to Authentication App, then follow the on-screen instructions.
  6. Enter the confirmation code from the third-party authentication app to complete the process.
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