Two factor verification problems

You can manage your trusted phone numbers, trusted devices, and other account information from your Apple ID account page.

You can update your trusted phone numbers when you follow these steps:

1. Go to your Apple ID account page.
2. Sign in with your Apple ID.
3. Go to the Security section and click Edit.

If you have more questions either visit this page:

Two-factor authentication for Apple ID - Apple Support

or contact Apple Support

See if anything here helps.  If necessary, you can use account recovery as explained in the link at bottom of the article.

Verification code - how to get one and sign in with two-factor authentication.