Your question is Communicate a Failed Experiment. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You ran an experiment that failed completely and did not produce usable results. You still needed to update the people depending on that work and decide what to do next.
Tell me about a time an experiment failed completely. How did you communicate that to your stakeholders, and what did you learn?