@MrBrow I have been reviewing this thread with great interest. We are also using a school in Hampshire embarking on TeacherApp, experiencing the same 'offline' errors with an internet connection from Hampshire County Council. We'd be very interested to learn if the changes you requested of HCC resolve the issue, and if possible, what the exact changes were that you requested. Separately, we also have a ticket raised with their helpdesk and are awaiting a response. Thanks.