Hello OA34! I'm Gunasekar and I'd be happy to help you with your question.
I'm sorry to hear that someone has made multiple attempts to sign in to your account. However, I'm glad to know that your account is still secure since two-factor authentication is enabled.
Two-Factor Authentication (2FA) does not completely prevent sign-in attempts, but it makes it much more difficult for potential intruders to gain access to your account. Two-Step Verification is a more secure way to use your accounts, as passwords can be forgotten, stolen or compromised. Two-Step Verification adds an extra layer of security by requiring a second step, such as using your phone, to make it harder for other people to break into your account.
If you are constantly getting unsuccessful sign-in attempts, I suggest these things:
- It's important to change your password regularly to keep your account secure. You can use a password manager service to help you keep track of your passwords and change them at least once a week. Many password manager services are available for free.
- Download and install all the latest updates for your Windows.
- Keep your devices safe.
Keep your Microsoft account safe and secure (Related article for your reference)
https://support.microsoft.com/help/628538c2-7006-33bb-5ef4-c917657362b9
I hope this information helps. If you have any questions, please let me know and I will be happy to help you further.
Best regards,
Gunasekar N