Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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To check your account's recent activity, sign in with your Microsoft account here-
https://account.live.com/Activity
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If you notice any unusual activity in your Microsoft account, select “This wasn’t me” on the activity page to report the issue to Microsoft. You will then be prompted to reset your Microsoft account password and update your security information.
If you encounter a situation like this, you should immediately secure your Microsoft account by creating a strong password and enabling two-factor authentication.
To do this, go to https://account.live.com/proofs/Manage and sign in with your Microsoft account.
Update your Microsoft account password.
Then, turn on two-step verification.
Important -
Make sure you have at least three verification methods active. (Recovery Phone number, email address and authenticator)
Once done, scroll down and select “Sign out everywhere”, this will sign you out of all trusted devices within 24 hours.