Icloud
I’ve been trying to log onto my iCloud and my email and my password is right however the number I have has recently changed and I’ve lost the other number so I ain’t receive my code when it asks after the login what can I do?
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.
If you can get signed in, you need to change/add the number on your Apple ID. 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.