It might happen that when you have recently created an outlook account, it locks your account assuming that your email account is not controlled by an original user.
You may face with this message:
We've noticed some unusual activity in your Outlook account.
To help protect you, we've temporarily blocked it. Verify
If you click on verify and a blank page pops-up without unblocking your account, you will have another option by clicking on
https://account.live.com/Activity
And following the procedure.