I just solo flawless Warlords Ruin dungeon and I never got my emblem, so I went to Raid Report and clicked on dungeon report and it said I died. I know 100% I didn't die during that run. This was a big accomplishment for me and that's why I'm so eager to know why It said I died.
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According to the app, it says you died at least once per each run you've done. Its possible you might have not cleared your checkpoint prior to loading in which counted the previous run's death. Keep at it and you'll get it, I had quite a few runs that got ruined from a silly mistake or bug, but it's certainly doable.