The aircraft identity is flagged up by the aircraft itself when it first sets up the radio link to the RC. So one thing to check is that the first LED on the RC is green, if not then the RC and aircraft are not talking to each other.
The first thing to try would be to relink the RC & Aircraft:-
Hi, I'm sorry to hear about the issue that you are experiencing. Could you please restart the drone, remote controller and the DJI GO app to try it again? If still no good luck, please show us a screenshot, thanks.
Hi there Patcologne I had the same issues a while back and did all the trouble shooting I could with no success, eventually had to send it in for repair