The ordering off only really happens on screen after Luke has rescued Han.

Which is why I suggested that the Empire try to capture the Falcon and Luke when they leave Tatooine on the ESB/ROTJ Wishlist and then only in terms of the Emperor knowing Luke will seek out Vader.

Vader doesn't want Palpatine in the way he wants to find Luke first so he can motivate him into working with him to dethrone the Emperor.

He must know Luke will return to Tatooine eventually have to save Han so it would make sense to leave a discrete Imperial taskforce to try and capture them all on the way out.