Gsync on laptop

I own a Dell XPS17 9700 with 2060 GPU. I have the Bios set to direct output mode and connected my xps to wd19tb dock, than wired to a Gsync compatible monitor, the LG 27GP850 with displayport. 

My problem being, Although i have enabled the adaptive sync feature and closed the overclocking option of gp850, gsync still does want to appear in the nvidia control panel menu…

Is this the problem of thunderbolt? Should I get a c to dp cable instead of wiring through the dock? Or is Gsync simply not supported on this laptop?