I have the Vanguard Mentor Missive to turn into Xander, but even though he has a green flag over him, he will not offer the Exotic Weapon Bounty.
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Edited by Byrdzilla: 4/28/2015 1:22:01 AMMost likely you have that bounty on you so it is not letting you pick one untill you finish the one you have on that character hope that helps