Apple Clasroom is not showing student iPads

This could be for multiple reasons so please check the following:

Apple Classroom works off a mixed environment of BlueTooth and Wireless, please make sure you have both Bluetooth switched on and Wireless connected and working.

Check which wireless you and the students are on. Staff should be in iOS_Staff and students should be connected to iOS_Student, if either you or the students are connected to a guest wireless there is no connectivity between devices so it won't work. If either student or staff are connected to guest please disconnect and forget the connection to the Guest network.