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The 4 pin connector can only go on one way on the motherboard, and the manual .PDF file that has the picture of the motherboard shows you where they are on the board that is on Lenovo's site for your computer.
https://forums.lenovo.com/topic/findpost/2250/5046054/5182274 I've got the same issue with my Legion 5, with the same specs actually (4800H, 2060).
https://forums.lenovo.com/topic/findpost/2250/5018199/5062630 I just updated my laptop keyboard firmware 00000044.