issues with Nighthawk x4 ac2200 wifi mesh extender

Good Day all.

I have 3 units involved.  I have the powerline 2000 which has a total of 2 units.  One beside my router and one in the living room that connects to my home entertainment.  I then have the Nighthawk down in my shop.  When I first purchased the units they all set up fine and everything was working great!!  Then one day I came down to the shop and the nighthawk wasn't connected.  I went and reset all the devices to factory settings and plugged them back in.  The 2 powerline units connected to each other immediately.  Now I can't get the nighthawk to pair.  Thanks for your help.