You may receive an email or text message from Microsoft reporting an unusual sign-in activity.
This happened to a lot of Microsoft account users.
It indicates theres a sign-in attempt from other people without your permission.

ThisMiniToolpost tells you how to deal with an unusual sign-in activity and the importance of MFA.
Microsoft Account Unusual Sign-in Activity
What is a Microsoft account?
Like other accounts, youll be asked to set a password when creating a Microsoft account.

Others are not allowed to sign in with your account without your permission.
you’ve got the option to Now Unlock Your Microsoft Account Without Password!
The security team has always been working hard to protect all Microsoft accounts, preventing unauthorized sign-in.

What will Microsoft do when discovering an unusual sign-in?
Meanwhile, a message will be sent to all your alternate contact methods for security check.
This helps greatly to prevent an unauthorized sign-in from new location/machine.

What you should do with an unusual sign-in activity alert?
Situation 1: its you to sign in from a different place or a new equipment.
You should suspect a malicious person is trying to sign into your account and do something bad.
MFA Can Block Over 99.9% of Account Compromise Attacks
Why account protection Microsoft is important?
The MFA offers extra barrier and layer of security to make it much difficult for attackers to get past.
There are 2 obstacles to overcome in the implementation of MFA (Multi-factor Authentication).
You should take a leap and go passwordless by enabling MFA.
you might enable it for most of your online accounts.