I have tried my spark drone with controller and all works ok, last night i wanted to try face recognition and hand launch, did all they said i should but once i pressed twice the front lights turned green for a second and then back to red , any advice?
Thanks

If you have the controller and phone handy, keep that linked and it will tell you what issues are preventing the launch.

Well, if it's dark it can't see your face. Or at least it can't recognise it, especially if you have black characteristics  ( hair / beard / color of skin).

Try it again in the morning

Hi, thanks for reaching DJI Forum. We do apologize if you are having issues with the face recognition of your DJI Spark. May we ask when was the last time you updated your firmware?