What's a backup code? How do I use it?
When two-factor authentication is on, every time you log into Instagram from an unknown device you'll be asked to enter a backup code or a SMS security code in addition to your username and password.
If an SMS security code can't be sent due to connectivity or SMS delivery issues, you'll still be able to complete the two-step authentication process with a backup code.
To get a list of backup codes for your account:
- Go to your profile and tap
(iOS) or 
(Android) in the top-right corner - Scroll down and tap Two-Factor Authentication
- Tap Get Backup Codes
To cancel your current backup codes and get a new set of codes:
- Go to your profile and tap (iOS) or (Android) in the top-right corner
- Scroll down and tap Two-Factor Authentication
- Tap Get Backup Codes
- Tap Get New Codes
Keep in mind that you must be logged in to your Instagram account to access the list of backup codes or get a new list. You should copy the codes to your clipboard, take a screenshot of them or save them in some other way so that they're available when you log into Instagram