Can't trigger Buff Studio Lights

[Roz]

I've got a big shoot this weekend and because it is expected to last the entire day, I was hoping to use my old studio lights so I can plug them in.

I've got a Sony A7r3, Godox x1-s receiver, Godox Pro Trigger-s, Godox AD200, a Paul C Buff Einstein and an old Paul C Buff White Lightning studio light.

All of the Godox stuff is battery powered only so I was hoping to use the Einstein and White Lightening.

My Set Up:

I have the Godox receiver on the Einstein and when I press the test button on the trigger, the Einstein fires.  So I know the sync cable from the receiver to the light is good and I also know that my trigger & receiver are talking to each other. 

Everything seem great until I try triggering the Flash with a shutter release.  It does not flash.  Did the same test with the White Lightning and had identical results.

I know for sure that the trigger is correctly seated on my Sony because I am able to wirelessly trigger the AD200 by releasing the shutter.

Camera:  Camera is set to Wireless Flash On, Flash mode:  Fill Flash

Any ideas what my problem might be?  Your help would be greatly appreciated.