You can try here but in my experience they will not be able to help when MFA is involved.
Use the Get Help app here to chat online with someone by clicking link
then "Windows", then underneath "home support" click on Get support in the Get Help Windows app
Also don't forget the contact options here as well.
https://support.xbox.com/en-US/help/account-profile/manage-account/lost-password-solution
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