Translation:I do not know the names of the agents that you are speaking about.
I wrote "I do not know the names of the agents OF which you speak", which is a normal way of saying such a sentence in English. Marked wrong and reported.
I think I might say "I don't know the names of the agents you're talking about"
The names, give me the names!
Haha duolingo is preparing us for truly all kinds of situations