I have received the DJI unlimit app from DJI. After installing I go to the General settings> unlimit area option and click. It says are you sure you want to unlock. Then it says SN no licese with my FC serial number. What am I doing wrong? The instructions from DJI say you must download the license available on the app after clicking the upper right corner. Am I missing a step or something? I do not see any option to download the license?