It would be awesome if you could give us more details about your network environment. Is there any network filtering in place? Are there any policies that block requests to certain IPs, ports, domain names or URL patterns? Are WebSocket connections allowed? Do you use a proxy? Do you have the same issue using the app in the unfiltered network?
In a given network environment, are these issues reproduced always across all of your devices and you persistently cannot open any space at all? Or do you encounter these issues only from time to time on some of your iPads?
Do you experience the same issues in CoSpaces web application running in a browser on your laptop or desktop computer connected to the same Wi-Fi network?
Unfortunately, the fact that the app is not connecting is not always enough for us to identify and fix the problem. We strive to ensure that our users have reliable connectivity in all possible network environments, so if you could provide us details about yours, it would be very helpful.
It would also help if you submit a “Technical problem” report directly from one of your affected iPads through CoSpaces Edu in-app dialog. Just launch the app on the affected iPad, login as a teacher, reproduce the problem and then immediately submit a report by pressing “Help” icon in the CoSpaces toolbar and selecting “Report an issue” option in the menu.