Tethered support was added in the 6.3 update.
I have the same problem. Since updating to Max OS X Sierra (currently running 10.12.3) on the 2016 Macbook Pro with Touchbar, I can't tether my Canon Eos 6D (now running the newest firmware 1.1.7).
I thought it was a compatibility issue with Lightroom 5 and upgraded to Lightroom 6 (6.7) ... Still not working.
I tried everything in this article:Fix tethered shooting in Lightroom
Am I missing something?
Shooting through wireless works with EOS Utility 3...
But my Mac just doesn't recognize the Camera, neither in Lightroom, nor in EOS Utility.