One-time passcodes are used to add an extra layer of security to protect your personal information and accounts. Sometimes, we’ll ask you to verify a passcode, which is usually sent to the mobile phone number on file. It should arrive in about 30 seconds.

If you didn’t get a passcode and need it resent, just select Send new code. It’s found just below the field you’d enter the code into.

See also:
What is a one-time passcode?
What is a registered cellular device and why do I have to have one?