1994 Chevy Blazer 4X4 engagement

I've replaced the 4wd actuator on the front diff and the transfer case switch, but still no 4wd. If I take the switch out of the tcase and depress it manually I can get the actuator on the front diff to work and the indicator light comes on. But it won't do this when installed. It's like whatever hits this in the tcase isn't doing it's job.

A little history, the tcase was replaced a couple years ago and in retrospect I think this is when it started. Also it has the electric front actuator not the thermal kind.

Could this have something to do with the linkage needing to be adjusted? And how do you do that? Or is it something else entirely different