[YZF-Rich]

The plate lamp is fed by the same circuit as the rear brake light, so if one works the other one is likely bad. Either the bulb is out, or a wire is loose. If it is LED, then maybe the wires are backwards. It should be fed by a blue with red strip wire (Hot) and a black wire (Ground).

I was leaning towards a bad ground, but it may be the backup fuse (#5). Easiest place to start is to check all the fuses behind the left side mid (clutch lever side).

 

[YZF-Rich]

Your gauges light up now as well? I was almost positive the headlight fuse did not feed the gauges, which is why I didn't suggest that. Glad you got it fixed.