Seems to be DOA, can not get my newer iMac or older macbook to recognize it. I upgraded to 10.15.4 on my iMac hoping that would help, but no luck, does not show up. I do not not get the keyboard message when plugging in. The pwr light lights up when plugged in but that’s it.
Have you tried multiple USB-C cables? There are some that are made only for powering boards but not transmitting data.
I’ve tried several different USB-C cables, one of which was working with a USB hard drive, and no luck.
Do you have access to a windows machine at all to check if it might be the Mac OS? If not, I would recommend pursuing an RMA if you want. https://www.sparkfun.com/returns