I have a new number and can’t get verification code

Assuming that you are attempting to setup a new iPhone (?) on an existing AppleID, you can receive (or generate) a verification code on the Mac in the photo. (Assuming that it’s on the same AppleID)

If your new iPhone is already on the AppleID, and you are trying to connect the Mac … you can generate a code ON the iPhone itself.

Detailed instructions for what was just briefly described are at:

Get a verification code and sign in with two-factor authentication - Apple Support

If we’re misunderstanding what you’re trying to do, please post back.

If you can get a code and sign in, you need to change/add the number on your Apple ID. Look in the Security section when signed in online. You may have to add the new number before you can remove the old number. After the change, allow up to 24 hours for the change to sync. Before trying to make the change, sign out of Messages/FaceTime on all devices/computers.

Apple ID - Manage