Also, the server I'm using this on hid the task bar icons, so it was a little while before I realized there was a place to right-click and pull up a GUI editor =P. The directions on your website are not incorrect.
FYI, for everyone else - he was able to fix it by deleting the contents of his c:\users\(username)\.TRIGGERcmdData folder. Then when he ran the TRIGGERcmd Agent, it re-prompted for a token and re-created his computer in his account.
In hind-sight he should have backed up his commands.json first (oops).
@Jim-Potash, in your Alexa app it shows you what Alexa is hearing you say, so you can use that to match your voice words for your computer and your command.
The word "reboot" for the command should be no problem, but you might have better luck using a different voice word for the computer.