It did, and has since 2007, but it is only symbolic. The delegates (of D.C. and the territories) only vote when (1) it's not on final passage and (2) the result would have been the same even without those votes.
ok, that was my memory .. in our then newly gerrymandered CD, the Dem Congresswoman voted for DC to have that vote. At a town meeting *someone* asked how that helped OUR cd and she couldn’t answer. The R beat her in Nov.