[quote]I got this with two characters but not the third wonder why this is? any idea why ?[/quote] i found out that you need house of wolves dlc to access the viridian outpost in the reef and it gives you an emblem and something else i think. i dont have the dlc but i found a glitch where if your friend has it you can join their fireteam and they can take you there. this unlocks the social area without the dlc

[quote]I got this with two characters but not the third wonder why this is? any idea why ?[/quote] you might have to speak to petra again if not then idk