To see how to 'Get a verification code and sign in with two-factor authentication', click here --> https://support.apple.com/HT204974
- Use a Trusted Device: Mac, iPhone, iPad, Watch. Code is either generated automatically or manually using Settings on the Trusted Device.
- Text or phone call to a trusted telephone number (any telephone; even landlines).
- Get a code from an Account Recovery Contact --> https://support.apple.com/HT212513
- Instructions at the end about what to do if you cannot get a code and need to use account recovery.
If you lack a way to view a verification code but can still log into your Apple Account, you can add a way to get a code. "You can manage your trusted phone numbers, trusted devices, and other account information from your Apple ID account page." Click here --> https://appleid.apple.com/
From: https://support.apple.com/HT204915