Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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Every so often I wake up to one or two windows Authenticator notifications requesting a log-in. These are not me, should I be concerned about someone trying to access my information?
First things first - change your password.
Is this a corporate account? If yes - ask your IT. They can help you.
You can also look yourself https://support.microsoft.com/en-us/account-billing/view-your-work-or-school-account-sign-in-activity-from-my-sign-ins-9e7d108c-8e3f-42aa-ac3a-bca892898972
If it is a personal account - change your password (if you have the same elsewhere - there too).