Heureka, I found the exact location(s) of nowhere! 
https://docs.particle.io/reference/cli/#particle-keys-doctor
https://docs.particle.io/reference/cli/#particle-keys-send
https://docs.particle.io/reference/cli/#particle-keys-server
BTW, some more info about your symptoms (e.g. what color codes does the device flash out) would be helpful.