Earned about 200 Vanguard marks but they aren't showing up in my inventory!
Also after buying the physical limited edition and redeeming all codes I can seem to get access to the day one Vanguard Armory. No Vanguard weapons are available to buy.
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You need to go to the hangar section in the tower. There you will find the Vanguard Quartermaster. You can purchase weapons from this vendor once you hit level 5. You get the emblem from the special orders reception on the other side of the tower. If it doesnt show up right away dont sweat it. I had to return to the tower a couple of times before it showed up. Vanguard marks dont add up like that. Marks you earn count towards increasing your factional rep rank. It starts at zero. When you visit the Vanguard Quartermaster look on the left hand side of the screen. The filled in portion of the circle shows how much rep you have earned.