How to sign in to microsoft team without auto switching account?

When I sign in to Microsoft team, it auto switch to my other account.

How to disable that auto switching and go to team of my login account?

How to delete that other account of me?

Microsoft have too many product that make link to other, some year ago it take me days to change password of skype, then I have to create account for live, hotmail..... for some product (or forum, I didn't remember) 

Now I try using team and it detect that I have more than 1 account, and auto switch to one of my account that I can not even login to delete it???