Hi! Sorry to hear you’re running into this. If the message on the account page says the account is blocked/locked, you’ll need to submit the reinstatement form here: https://www.microsoft.com/digitalsafety/account-reinstatement
This is different from the standard Account Recovery form. It’s specifically used when Microsoft has temporarily locked an account due to suspicious activity (for example, unusual sign-in attempts), and you’re requesting a security review to restore access.