Per Bungie twitter: https://twitter.com/BungieHelp/status/1190305714427744256
If I had to guess, probably need another rare bounty =/
Maybe /u/Cozmo23 or /u/dmg04 could confirm, that way people can farm that up before next week?
If you used your Crystal or Bounty you will have to get another one. Sorry, wish we had a way around that.