I got a notice that they're going to start charging me for my Microsoft 365 Business Premium account. The email was sent to my personal email address but when I sign in with that account I can't see a Microsoft 365 premium account so I can't cancel it. I created it as a learning exercise while doing online training so I don't want or need it. The links in the email they sent me aren't taking me to the account. How do I get to it so I can cancel it?