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 profile or your profile picture in the bottom right to go to your profile.
  2. Tap more options in the top right, then tap settingsSettings.
  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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