I do not have a direct answer to your issue. If you have a current subscription, you will first need to ensure that you have first updated to the latest software version so that the VIN can be properly detected. The next thing is that I find it easier if you first select "Citroen" as the manufacturer, then you can use the AutoVIN detection feature. Does the tool autodetect any VIN from any other manufacturer or vehicle than the one you are working on? I suspect your issue may be related to the version of Citroen module. You should not need an active internet connection unless you are doing an online coding or doing anythng with immobilizer related units.