Windows won't activate on laptops

We have windows 10-64bit machines. Our pc's image & activate fine. Our laptops do not. We are using the Lenovo EliteBook 840 G1 and G3 models. The laptop's lay the image down but they don't activate windows. I'm using the exact same sysprep settings with the MAK key code in pc & laptop master images.  Both capture and deploy all have same settings.  I'm able to manually add a windows key and activate but would prefer to have this automated just like our pc's. Drag and drop an image and walk away.  Does anyone have any ideas or suggestions? 

Thanks -