Then you'll need to recover the account if possible. Try resetting via the account recovery form
https://support.microsoft.com/en-us/account-billing/help-with-the-microsoft-account-recovery-form-b19c02d1-a782-dee6-93c3-dc8113b20c42
Use the Get Help app here to chat online with someone
https://support.microsoft.com/ContactUs
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