I can get my gmail verification code to my mail app

Hello,

You will need to reach out to Gmail's support for assistance with their product.

Are you having trouble signing into your Apple ID or your Gmail account? If you are having trouble with your Gmail account then you need to call Google. You can use a Gmail email address as your Apple ID. Are you having trouble signing in with your Apple ID?

Can you log into appleid.apple.com?

or are you trying to log into gmail.com?

I am sorry, there is nothing I can do to help you. I do not have access to Google's recovery system as I am not a Google employee. You will need to either call Google or email them again.

Hello,

If you "can" get your verification code then what seems to be the problem?

A quick web search will yield support options for Gmail.

https://support.google.com/mail/?hl=en#topic=7065107