I've done all the BRAVE weapon quests, got both Superblack keys, and my triumph is stuck at 7/8. Talking to Ikora, Shaxx, Hawthorne, Devrim, etc. does nothing to progress this triumph in any way for me.
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I'm in the same boat. Not sure if something was bugged from the get go or if I got bugged because there was a moment where i completed 2 weapon bounties at the same time and only got 1 milestone update when i went back to orbit. Stuck missing 1 to complete the triumph.