Some info for you:
4.6 issue, nonetheless, it’s worth a try.
https://answers.unrealengine.com/questions/66995/matinee-actors-dont-collide-with-pawns.html
Same issue, same 4.6, yet again, it is worth a try!
https://answers.unrealengine.com/questions/35812/object-collision-for-moving-actors-in-matinee.html