I am not receiving verification cods on my iPhone
Hii not received verification codes in my phone
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iPhone 14 Pro Max, iOS 18
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If you are referring to two-factor authentification codes from a 3rd party (non-Apple), then those rely on SMS short code t(text messaging). In that case, it may be a problem that only your cellular carrier can solve for you. Here are some tips for troubleshooting messaging on your iPhone itself: If you can't send or receive messages on your iPhone or iPad - Apple Support
If you are referring to the code displayed on a trusted device when logging into an Apple Account, then this support article may help you: Use two-factor authentication for your Apple Account on iPhone - Apple Support