Did the whole dungeon solo, and it didn't give me the triumph for doing all encounters solo. Felt like a waste of time doing the whole thing for a triumph only to not get said triumph.
Edit: forgot to mention I also got NO LOOT for the last encounter and it was my first run since reset .
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For solo, flawless and solo flawless triumphs, the entire dungeon needs to be completed from start to finish in a single instance. That means no leaving and starting again from a CP. Any error codes you receive will ruin your run.