There is two things I have not seen mentioned here that come to mind; One is each aircraft has to be logged online that 1st time or the motors wont start. The other has to do with the GEO zones, and if your with in certain distance of where large people events take place,...the motor wont start without agreeing to whatever it is there on dji.com.
*Log into dji through the GO app.
*Use a different device to host the GO app.