Recovery codes: Recovery codes are provided by the account service provider (Instagram or Facebook, for example) when you first enable two-factor authentication .... First, double-check that the SMS code is actually being sent to the correct phone number. Then, you can try resending the SMS code through the .... Make sure you have the most current operating system on your device.

(Settings > General > Software Update). We would suggest trying an app specific password ....

To fix the issue of not receiving Facebook confirmation codes, set up and use recovery codes from your Security and Login settings..