Hello, thank you for reaching out to Microsoft Q&A.
If you tried to sign in and received a message that your account is locked, you can try the Outlook Sign-in helper tool below unblock your account.
Unblock my Outlook.com account
If you are still having issues, you can try the account recovery form to unblock your account.
https://account.live.com/acsr
Remember to use a familiar device from which you've frequently accessed your Microsoft account, as well as a familiar location. Microsoft will review your responses and respond within 24 hours. If you are verified, instructions on how to log back into your account will be sent to you, and if you are not verified, you will need to submit the Account Recovery form again. You can do this up to 2 times every 24 hours.
Important: The account recovery form can only be used if two-step verification isn't turned on.