Managing personal Outlook.com account settings, security, and privacy
Hello, thank you for reaching out to Microsoft Q&A.
You will receive the Single-use code if someone tried to access your account.
Please visit your Microsoft Account Recent Activity page to check for any suspicious activity:
https://account.live.com/Activity
If you notice anything unusual,
Click "This wasn't me" to report the activity to Microsoft or you will be guided to secure your account.
Regardless, we strongly recommend taking the following steps to protect your account:
- Reset your Microsoft account password.
- Enable two-factor authentication (2FA) for added security.
Sign in to the security settings page of your Microsoft account here-
https://account.live.com/proofs/manage/additional
Scroll down until you find the 'Sign out everywhere' option.
This will sign out your account from all the trusted devices, possibly within 24 hours.
Let me know if you still need more help.