Refugee's Mission / AI Not Moving.

I went to the objective, took down the gendarmeries and got the prisoners on my team. I give them orders from the "é" menu and they just keep saying negative and not moving at all. I'm sure I did everything I even made them another group on their own and tried to assign the car to them on the Y menu and when I said mount they all kept saying "Negative."

It was my first time playing this mission so I want to know if its just bugged or I did something wrong cause I just killed all of them to fail the mission xD. (The truck I assigned had enough seats, I tried one by one as well and didn't work.)