MacBook asking for very old passcode

I’ve been trying to set iMessage on my new MacBook and it’s asking for a passcode to a phone I haven’t had in 3 years, I still use the same Apple ID I’ve been using for many years and have set up on my current phone so I don’t get why it’s asking for a passcode from an old phone even asking for the Apple ID password I had back then too that I don’t remember also