I completed Crown of Sorrows last year and despite having a completion on my raid report and a screenshot of unlocking the triumph, I have neither the triumph or the emblem unlocked. Not sure if there's anything support can do about this these days, but I thought it would be worth a shot regardless.
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Hey, Unfortunately nothing can be done, due to the content being vaulted any additional achievements that went along with it including emblems and triumphs are also gone, if you did not have the emblem in your collections at the time of Crown or Sorrow being vaulted then it is gone forever.