Success. I have all three axis moving.
I had some problems with the endstops that I’m still figuring out, but I’ve been able to disable the endstops in the software so I can get things moving.
You will notice in the video at about 0:40 it appears to ‘jam’. This is because I’m pushing the speed to the maximum limit. This is the steppers trying to keep up at the low current I have them set at. I could pump up the current output, but I think I will start slow, keep the steppers controllers cool, and work my way up to faster prints.