This just happened and it's driving me insane. I completed a [b]full[/b] spire dungeon solo. Time of 81 minutes. You can check my dungeon report - Fully solo and fully completed. (Takeo Masaki#7438)
It gave me a "Bee" error soon before defeating the final boss, it reset me to the start of the final encounter again, I wasn't mad about that because I wasnt that good on DPS that run but after that error code and fully completing the dungeon solo...IT DIDNT GIVE ME THE TRIUMPH!!
Bungie please resolve this, check my account and award me the triumph :(
Because you said you were kicked out and went back in with a checkpoint
Checkpoints don't count
So you had to start all over again from the beginning of the dungeon after you got kicked out
So no, you don't get a triumph as a gift because you didn't complete the whole dungeon alone in one session