We an Outlook user tries to get into own account; it requires the user to use the correct combination of Outlook user Id and password. The Microsoft users have a single user ID to get access of all accounts as Skype, Outlook, Microsoft Windows 10 account and messenger too.
You can easily imagine a situation when a user has lost the password for Outlook account and then struggling to get into own account. No surprise, there would be no other way to get into your other associated Microsoft account. Users might be feeling that they have lost their account; this is too early to say that as you still have chances to get back control of your account.