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See if you have power going to the bulb? Use a multimeter.
If you have no multimeter and want to diagnose via parts changing, swap with a known good bulb and test.
Also, see if you have the polarity reversed. IDK how these bulbs bases look, but if they can be installed backwards, there is a chance they could be in backwards and therefore not work. LED's are not like incandescent bulbs, some of them require power going to a specific terminal or they will not work. The LED's that can be installed either way usually have diodes and stuff in their circuit to correct the input voltage.
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