Hi @Mark Kover
Events created in Outlook appear in Teams because the meeting you created has the option for Teams meetings enabled. Only meetings with the option for Teams meetings enabled appear in the team calendar. In other words, meetings in Outlook may not all appear in Teams (unless Teams meetings are enabled), but meetings in the Teams calendar will certainly appear in Outlook. This is by design.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.