Are you doing damage to the strike target within 30 seconds of it going down? Are you near your teammates?
If you do not do any damage to the boss towards the end, the bounty may not get marked as complete.
https://www.bungie.net/en/Help/Article/12187
I've also had a few instances where I or a fireteam member didn't get credit, even though they were doing damage, but we were all spread out. It seems like you have to be somewhat close to the guardian that lands the killing blow too.
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Never happened to me before as i/we always use the same '3 point arena' tactic where we are spread around the arena distracting the nexus. I actually delt the final blow.
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Do you have that bounty left over from last week? According to Destiny Tracker, your Hunter did not get credit for the killing blow on Sekrion either time. [url=http://destinytracker.com/destiny/games/2/4611686018449249870/2305843009310524121/2859041797?page=0]game 1[/url] [url=http://destinytracker.com/destiny/games/2/4611686018449249870/2305843009310524121/2858939441?page=0]game 2[/url]
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I got it finally after 3rd attempt.
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No got it today. I was sure I got the final blow on the 2nd run as it blew up when I hit it. Whatever like.