Your question is Gathering Requirements Under Ambiguity. 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).
Tell me about a time you had to gather requirements for a project where stakeholders were not aligned or the problem was still vague. How did you clarify what was needed, document it, and make sure everyone agreed on the final requirements?