I just completed the Fall of Winter quest, solo, and shot Riksis in the face till he went away. I did not get credit for completing the Archon Slayer bounty. This happened to me yesterday in the Devils Lair with Septiks. Very frustrating.
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Going to say this may be a bug as I also had the same thing happen earlier today. I have the bounty, I am not wearing Faction Gear, completed the Strike on Level 24 and didn't get the reward.
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I just did the phalgor one it doesn't require modifiers and did not get a completion
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Sometimes those you have to have heroic modifier active. Did you? Or did you just do the normal one.