I actually just reported the same issue yesterday with me as well. The fact that this triumph breaks from leaving is so moronic. It says solo it, so we did. I even had my fireteam closed the entire time I was anywhere near the pit. This needs to be fixed. I have to waste even more time now re-running the whole damn thing just for the triumph to actually work, in one sitting.
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Wait...... do you need to solo pit of heresy to get the sword? how does it work? Cause I did it and I didn't get no code!
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oh wait..... do I need to activate the triumph of completing the pit first? if I do ignore this post!
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I also closed my fireteam all throughout just in case someone randomly decided to join. I agree with you 100%, they need to look into it at least.