How do can I sign into my Xbox account?

If you have important proof of ownership for that account (emails, important screenshots, etc)
You can try opening a chat with Microsoft support and explain them the situation

(Please note that this doesn’t guarantee an account recovery)

Hi, unfortunately no one at Microsoft can send password reset links or modify account information due to security reasons

If none of the methods above worked for you, you may need to create a new account :c

I am not wishing to reset my password or alter security information. I simply wish to use my account. I have spend thousands of dollars over the years on this account and have too much time spent grinding games to give up on it like this. As soon as I got the notification that this unusual activity was detected I checked my banking account and saw no money being spent that wasn’t me. So if there is suspicious activity can’t they tell what it is and I say “yes that was me, or not” using my password and all the other information I have to tell them “it’s me” as verification. I’m sorry, I understand that’s not how this works but I’m not giving up on my account like this

So I’ve tried to contact the Microsoft help desk people but they’re not giving me anything useful other then filling out the verification form as accurately as possible which is what I’m doing. I’ve followed the link you sent and went down the tree to recover my account and even changed my password but afterwords when I go to sign in I’m having the same issue with my console not thinking that I’m me and asking that I fill out the verification form that I keep getting denied.

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today despite this LucasGaido

Sorry to hear that you’re no able to verify your identity
When the recovery form is rejected these are the options available for you
https://support.microsoft.com/en-us/account-bil...

Also, you could try alternative methods to recover your account here:
https://support.microsoft.com/en-us/account-bil...