Traduction :They did not have a response.
Why is they did not get any answer not correct?
I think your answer is correct, but "response" is a new word in this lesson, it is possible that Duolingo prefers we write this new word for this lesson but your response will be accepted by Duolingo.
"They did not have a answer" ne marche pas ici ?
Same for me! "Answer" should work as fine as "reply"