Button shim LED not working (but buttons work)

The LED never turns on. The example scripts work for the button detection, but the rainbow example doesn’t do anything with the LED.

I have soldered pins 3,4,5,6, and 17, per this pinout: Button SHIM at Raspberry Pi GPIO Pinout

Buttons work like a champ, so i2c is working, and I presume that the LED communication is i2c as well?
I assume I messed up soldering (this was literally my first soldering attempt ever), but I’m not sure which pin the culprit would be.