in airplane mode can't receive verification code?

Hello Dude0998,

The title of your post seems to be the root of your issue receiving your two-factor authentication code.

Use Airplane Mode on your iPhone, iPad, iPod touch, and Apple Watch - Apple Support -- When you turn on Airplane Mode, this effectively disconnects your iPhone from the internet. Both Wi-Fi and Cellular won’t work, so you can’t receive the two-factor authentication code.

The article that was linked to your posting explains more about verification codes: Get a verification code and sign in with two-factor authentication. In this article, it explains the different ways you can get a verification code to help you with resetting your Apple ID password. It also directs you to how to use Account Recovery, should you remain unable to reset your password.

Just to make sure, you mentioned a passcode so if you are not referring to an Apple ID password, but the actual iPhone passcode itself, check this article for help: If you forgot your iPhone passcode.

Let us know if we can help with anything else at all or if this doesn't settle your issue so we can look into this further with you. Thanks and have a fabulous day.