I think you have to make the students attendees. By default everyone in the org are presenters I think. When you create the meeting, you should be able to click on meeting options in the calendar entry. Look for the presenter options.
See here for more
https://support.microsoft.com/en-gb/office/roles-in-a-teams-meeting-c16fa7d0-1666-4dde-8686-0a0bfe16...
