If only. An old phone number of mine is still somehow tied to my Google account. I can’t for the life of me figure out how to remove it. Google sometimes random

If only. An old phone number of mine is still somehow tied to my Google account. I can’t for the life of me figure out how to remove it. Google sometimes randomly decides to send the access code to my old number, which I no longer have, instead of using the new one. The only solution when that happens is to try the login again from an incognito window, hoping the Google decides to use the right number. Getting locked out someday is a very real possibility for me.