Auth command missing

I have tried to use the guide for installing a COA on my pixhawk board: dev.ardupilot.com/wiki/how-to-us … henticity/

However I connected to NSH and tried the auth command but it says command not found.
I have also used the master from Git and compiled that but get the same problem.
Does anyone have an updated guide to getting a COA onto a Pixhawk board?