I just build my redox keyboard and I found a problem about the right hand side is not working when connecting via the TRRS cable
Ergonomic, split and other weird keyboards
Posts must be of/about keyboards that have a clear delineation between the left and right halves of the keyboard, column stagger, or both. This includes one-handed (one half doesn't exist, what clearer delineation is that!?)
i.e. no regular non-split¹ row-stagger and no non-split¹ ortholinear²
¹ split meaning a separation of the halves, whether fixed in place or entirely separate, both are fine.
² ortholinear meaning keys layed out in a grid
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Im not familiar with the redox, but i see you got two unpopulated resistor footprints around the trrs connector.
Are you sure the resistors are optional?
I think this is the answer, there might be more issues with the state of the soldering but the build guide says it needs them (indicating they're using i2c for split comms).
OP needs to add 2x 4.7kOhm resistors on one half of the keyboard.
This. I built the redox and you do need those resistors, but only on one side if I do not remember wrong