I did a lvl 28 strike and it was vaal us tarc. At the end of the strike it said I got a legendary hand cannon, but it was never put into my inventory which is crap cuz I got the rare helmet engram that was my other reward just not the legendary hand cannon. I would like this fixed or least let you that this issue is there and a problem.
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If your primary weapon slot inventory is full (holds 9 weapons, 10 if you count your equipped weapon) your reward will be at the post master instead of your inventory. That is probably what happened.