Your question is Biggest Failure. 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).
What was your biggest failure? Please describe a specific professional example, explain your responsibility in the outcome, and walk me through what you did afterward. I am looking for ownership, honest self-assessment, the actions you took to recover, and evidence that the experience changed how you work.