Does the bike start in neutral without having to pull the clutch in?
If yes, then the switch is OK and there is possibly an issue with the bulb in the instrument cluster.
If no, then check the switch electrical connector is in place (it is a push-fit behind the front pulley cover - partially covered by the front pulley at about the 2 0'clock position) and the continuity of the switch itself.
A quick test of the instrument light is to remove the connector at the neutral switch and ground that point with the ignition on.
It is isn't too uncommon to have that switch fail (my '06 Uly had this fail very early in it's life at about the 12,000 mile point).
Assuming the worst, it is a bit tricky to replace but don't let a shop convince you that they need to remove the front pulley to replace the switch. I modified a cheap socket so it would fit in behind the sprocket with the belt moved out of the way and I have seen some other home-brew tools made that looked like they would work with the belt in place.
This was my solution but there are others - the switch only has a handful of threads and has a fairly modest torque.
BTW - with the bike in neutral you should measure 0 ohms between the centre contact you can see in the picture and the body of the switch.
The neutral light will actually work with some resistance in this switch because of the very low current drawn by the bulb but for the start relay circuit to operate correctly this resistance needs to be very low.