PPK2 unable to show nRF52840DK current draw?

Hey I have a Power Profiler Kit 2 that I want to use to measure current from a nRF52840DK, but the profiler software is only showing 0-0.8uA, regardless of whether the DK is powered on or off.

I've connected the PPK and DK as shown below. I have one GND from PPK connected to DK GND, and then PPK VIN+VOUT connected to DK P22. USB connected to DK for power, and a USB connected to PPK data/power port.

I believe I've setup the application correctly, setting it to Ampere mode, and turning off the "enable power output" option since the DK is powered via USB.

What am I missing?

Update: Actually if I remove the 4-pin header from the the PPK, there's no change in the observed current values. The 4-pin header is pushed in all the way, and I tried swapping it around just in case I had it mixed up, but it appears as if there's no connection between the PPK and DK?

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