How do I acess my account with a number I dont own?

What you are trying to update is what Microsoft (MS) calls the security proof of the accounts.

If you know the email and the password for the account but do not have access to any of the security proofs currently on the account you can update the security proofs. KEEP THIS IN MIND THOUGH when you start this process there will be a 30 day hold placed
on the account for anything that requires a security proof.

Basically it takes 30 days for the security proof update to go through so that you can use that new security proof.

Basically if you sign into your account and go to anything that requires a security proof Quick and easy one would be to go directly to account.live.com/addassocid (this site is for adding a new email to your account) it will then ask to verify ownership
of your account there would be a choice that you do not have access to any of these when you choose that it will take you to a page to update your security proof but remember my note above there is a 30 day hold placed on the account and the ONLY way to cancel
this change once it is started would be to gain access back to the old security proof.

Do you by chance have a contact email associated with your said account? Alternatively they can be used for recovery, you could also click "forgot password" and fill out your recovery questions to the best of your ability, but you should be able to just
use the email associated with the account. try signing into your account via email through https://account.microsoft.com/account?lang=en-us if the issue persists
reply back to this thread and i will further try to help!

Well well well... i see another ip adress accesing my account well.. i have seen the ip lots of times in the ip log in place but i don t know what to do or how do i stop it. i logged my microsoft account out from everywhere yet still this ip is acessing my account i dont how to stop the ip from acessing my account

hi thanks for the reply and info about , was not aware of those things you mentioned , we both own individual games , i also own digital download games , did not think someone could acess them, have already spoken to them about opening their own acct and
changer their gamertag , because at the end of the day even though its a friend of 30 yrs they still have acess to my acct details and i dont want 1 of their kids acessing and buying from my acct , the other person does not have an acct as he has never had
internet acess until this week , thats the problem thank you

Hi, my name is Ezequiel and thank you for your question and for reaching out. Hello Jay Koala how are you?

I am very sorry that you are unable to recover your account.

Unfortunately the only way to solve your problem would be to fill in the form or get acess old phone number.