Teams Guest

Hi, I have been using Microsoft teams for a while now. Its really helpful for online classes. One thing I experienced today was that while I finished taking classes somehow apparently I created a chat group with 48 people. Of course it was not me. it was quite embarrassing for me as I did not know the people as well. I think somehow someone managed to hack my account and created that chat group. I want to know which devices was I logged in on Microsoft teams on 8 June ,2020. Thank you.