Assignments not accessible in Teams

The Assignment app has stopped accessibility from our classes in Teams. When student click on an new assignment, the notification that comes up is: Something went wrong - come back later ... and that has been for several months. The same goes for teachers who try to open the from the team. I can only make an assignment when I go to the global app in the Me space. And when I assign it, the students can't open it, and have to go to the Me space. Does anyone know how to fix it? We love the app, so we want it to work as smooth as possible. Thank you for any help