How can I check my recent sign-in activity?

Microsoft 365 logs all your recent sign-in activity, go to https://mysignins.microsoft.com/ 

The logs will show both successful and unsuccessful sign-ins (the unsuccessful could be an attacker trying to guess your password). The unsuccessful logons show the importance of using Multi Factor Authentication, and if you receive unexpected authentication requests you should assume that your password has been compromised so should change your password as soon as possible.

Note that location is the location of the internet service provider (ISP). For the Mill Hill schools the ISP is located in Studley, Warwickshire.

If you see a sign-in you don't trust, you can click on "Look unfamiliar? Secure your account" to verify your Multi Factory Authentication (MFA) settings - you can use multiple methods for MFA, for example Authenticator App, mobile phone, and home phone number.