During the academic year rollover process in Microsoft School Data Sync, schools can choose clean-up actions for their old class teams. The most popular and recommended clean-up action is “Archive”. It’s much easier for teachers and students to see current teams when they login.
The archived teams appear to vanish leaving the user with all the current classes for the new academic year.
However, they have not disappeared, and the teacher/student can still access the team in read-only mode.
In the video below, Darren Hemming from Cloud Design Box shows you how you can access archived classes from previous academic years.

Cloud Design Box customers can benefit from an option in class dashboard to switch back to a previous academic year.
Talk to the team at Cloud Design Box if you need help with Teams for education.