Sorry, took longer to reply then I've wanted...
No Green light, on JOUÉ not good. Check cable, on the USB-C end, connect firmly.
Can you test with "something" else?
Use a Mac or PC and JOUÉ Editor (latest is 1.4), update its firmware if requested (it was the first thing I did with mine)
You can use midi/in/monitor to simply check what JOUÉ is sending (on Console log)