http://www.pcgamer.com/theres-already-a-bonkers-faction-rally-token-farming-exploit-in-destiny-2/

With the weekly reset, Destiny 2's first Faction Rally has kicked off on PC. You can find the full explainer here, but the basic gist is this: choose a faction, earn tokens, and turn them in for faction specific gear. At the end of the event, the faction with the most tokens earned will grant all of its loyal players access to a special weapon at a discount price. 

Previously, players could run the same Lost Sector over and over, destroying supplies for fast token drops. But this time around, Bungie removed the supply drop reward, rendering Lost Sector runs moot.