I gave the Gunsmith at the Farm the stuff needed to get rewards. I reached 100 and when I tried to collect it, it won't show the engram (or whatever the color thing is called). I just ignored it and went on. I've quit and played Destiny 2 multiple times over the past few days and it's still in the suspended state where it says that I am rewarded for my efforts but it won't show the engram for me to collect. :(
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You need to finish the Red War campaign.