Managing personal Outlook.com account settings, security, and privacy
Hello,
If you tried to sign in and received a message that your 'Account is locked', you can use the Microsoft Sign-in Helper tool here. This tool will help you with the exact steps to recover your account.
Microsoft account sign-in helper
Alternatively, you can try the Account Recovery form here to recover your account. But this form doesn't work if you have two-step verification enabled.
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.