Take a piece of wire and connect power directly to the fixture - either through its connector, or by cutting the wire going to it. Even new bulbs can be bad.

If the light goes not work, you have your mission.

If not - ask - What just happened before the problem? Did you bottom the car or run over something? Was something done to the car?

The rear hatch takes a beating compared to the rest of the wiring to it. This is where I would look.

Do the license plate lights work?
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'96 855R,'64 PV544 driver, '67 P1800 basket case, '72 Yamaha Rd400, '68 Honda 350-4, '12 XC70, the first 5 are mine, heh, heh, 525,000 miles put on 10 bricks James A Sousa