A recent update in Outlook update defaults newly created calendar items to automatically add a Microsoft Teams meeting link to the event.  If you do not wish to use this feature it can be disabled by opening Outlook, clicking on "File", then "Options" then "Calendar".  Once there uncheck the box labeled " Add online meeting to all meetings" and then click "OK"

For directions on a Mac or Online please reference this article: https://gregmicek.com/information-technology-it/2022/01/06/how-to-prevent-outlook-microsoft-365-from-automatically-adding-a-teams-meeting/