I'm glad you found a solution but this issue is more common than you think, and I have been able to reproduce it on 3 brand new Yeti Pros.
With many Yeti Pros and the latest Macs that have USB2/3 ports the mics will produce no sound at all even after pluging in multiple times, re assigning them under Sound preferences, or adjusting all input/output volume sliders
The issue in most cases is that the Physcial Mute button on the mic is not communicting properly with the device settings under the "Audio MIDI Setup" app on your Mac. If you open up Audio MIDI Setup, you will see your Yeti Pro as a device with 3 checkboxes, Master, Ch1 and Ch2. The Mute checkbox next to Master is what's causing the issue...the physical button on the Mic is supposed to toggle this checkbox, but doesn't. Unchecking manually will fix the issue...but it's not a permenent fix, and Blue has shown know signs of resolving this issue.