I don't get it, could not do it in the beta and can't do it here is execute not the right thumb stick?

am i doing something wrong?

Don't know what your problem is? You ARE in cloak aren't you? It is just tempermental in my experiance.

A lot of the game is tempermental. You could be looking at a weapon one way and not be able to pick it up, but look at it from another angle and it registers. OR it just wont at all... Your tatical visor registers the weapon as interactable but no matter how you look at it, you cant grab it.