Has anyone successfully used the Subway app for Windows phone and linked their Subway card to it (the first step in the process of actually using it)?

Every time I attempt to do it, I just get a error of “Sorry there was an unexpected problem, please restart the application and try again”. Phoned the 0800 number for Subway and conversation did not get off to a good start when they had never heard of a Windows Phone device. Anyway have subsequently sent off some screenshots, so we will see what happens.