It’s very likely that your account was automatically locked by Microsoft’s security system after detecting activity that appeared unusual. This can happen after multiple failed sign-in attempts, signing in from a new device or location, or behavior that the system flags as potentially automated. When this occurs, Microsoft requires strong proof of ownership before access can be restored.
Unfortunately, in situations like this, the account recovery form is the only available path.
This guide explains how to complete the recovery form as accurately as possible: https://support.microsoft.com/account-billing/help-with-the-microsoft-account-recovery-form-b19c02d1-a782-dee6-93c3-dc8113b20c42
I know this may not be the outcome you were hoping for, but if recovery attempts continue to fail, there is no manual override process. Support agents are not able to bypass the automated verification system. Without sufficient proof of ownership, the account cannot be restored.