Managing personal Outlook.com account settings, security, and privacy
Thanks for using Microsoft products and posting in the community.
I realize that you've encountered a problem with Microsoft account ,and I unstand how you feel.
But there are a few things to confirm.
You are logging in to your Microsoft account on your mobile device, and the software requires credentials. Or say you received an email saying you need to provide credentials.
If it's the former, please explain the application you use to log in to your Microsoft account.
If it is the latter, and you have not actively requested to update your credentials, you need to be aware that your account may be used abnormally.
In order to ensure the security of your account, you can go to Microsoft's official website to reset your password.
Or add two-factor authentication to keep your account secure.
Change Password: Change your Microsoft account password - Microsoft Support
Two-step verification: How to use two-step verification with your Microsoft account - Microsoft Support
If you have two-step verification turned on, here is an important tip you need to pay attention to.
Please see the picture below for the specific content of the prompt.
We look forward to your response.
Best Wish
Yung.D| Microsoft Community Support Specialist