Managing personal Outlook.com account settings, security, and privacy
Hi Miloš Krstić,
Welcome to the Microsoft Community.
I understand that you received some emails about security information but you did not request it. Then it could be that someone accidentally entered the wrong phone/email when trying to log in.
Note: Do not respond to any code that was not requested. If someone tries to access your account without a code, your account is secure.
To further protect your account and stop getting unsolicited codes, you can “No Password” on your Microsoft account:
Rest assured that this usually poses no threat to the security of your account, and you can enhance your account security appropriately.
Contact me again if you have any other questions.
Best Regards,
Jimmy Wang |Microsoft Community Support Specialist