Legacy email login won't let me use MS Teams

When I try to log onto teams (free version) I am told that my email is alreaady registered to a work/school account and that I need to contact the admin there. Problem is, it is my personal email and domain name and I have not used a pay/business account with Microsoft and this email. The rest of my microsoft products use this email, but they are just paid Office packages, not 360 or subscription. Can someone help me use this email to log into teams?