All 6 time trials are completed, including the triumph asking for all 6 ascendant challenge time trial completions.
And yet. The. Non. Time. Trial. Triumph. Is. 5. Out. Of. 6.
What is this?
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Hey, "Ascendant Champion" is not related to time trials, it's awarded merely for completion of the Ascendant Challenges. In last week's update, Bungie fixed an issue where two of the challenges were not awarding progress upon completion. It's likely you are missing one of those two. You will need to wait until they rotate back around and complete them again. Source: https://www.bungie.net/en/Explore/Detail/News/50186