Hi Aaron,
If you know how to dismantle the keyboard, open up ... clean up the keyboard from dust and use an eraser to rub on the contacts of the LVDS cable... reinsert and try again.
take caution on the delicate plastic locking mechanism locking the lvds cable of the keyboard module.
If you had tried and it does not work still,
There is a possibility that the keyboard internal circuitry path is faulty.
It is a common issues for laptops actually.
internal track wearing off…..
If your laptop is still under warranty, send it for service or consider replacing the whole keyboard module which i think is a better solution which you can try sourcing the replacement parts at amazon, ebay, aliexpress, etc.
https://www.amazon.com/KBR-Replacement-Chromebook-C202SA-YS01-C202SA-YS02/dp/B07KLK84JN