Both alternatives are correct English, but they mean different things. "Listen to me" is a request, so of the two "You are requested" is closer in meaning.

I don't think it makes sense to make an imperative into a passive. I just found a website that claimed to do so, but it all sounded very Inglish and unnatural.

You are supposed to listen to me. Or You are requested to listen to me. Which is the right answer for the above question?