Hi @IT Support
First please refer to this document to learn how to restrict users from creating teams.
If you have used the method in the documentation and are still able to create a team in Teams, please try clearing the Teams cache and restarting.
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.