I'm using the CalDigit USB-C Dock and the Mac said it is using the power adapter, but my battery is slowly draining:
I did an SMC reset and reset PRAM (NVRAM) but still won't charge.
Why isn't my Mac charging?
As it turns out, the USB-C I was using is bad. I swapped the cable out for a different one, and the laptop started charging again through the dock.