Need help powering off Intel NUC with Harmony Elite

Needs a debug log.

...enable debug logging, restart, try switching off again, post debug log.

If you've enabled debugging in the gui it's obvious because you have text all over the screen.

Looking through that there's no power key detected at any point. Without knowing how your Harmony is configured all I can say is to map Shutdown() to a key you know works (one that shows up in the log) and try again.