The Ramban, when explaining the “forgotten” Mitsvot of the Rambam, does not say that there is a Mitsvah to conquer E”Y Today.
In that paragraph, the Ramban uses the expression of conquering 11 times. BUT in the last third of that paragraph, he changes his language to say that even today there is a Mitsvah on each individual to inherit it and live there. IMHO, he is working with the 3 oaths. He leaves out “conquering” and says “laReshet” (which may include hard work), and he says “col echad” and not the tsibbur.