Your question is Structuring an Ambiguous Technical Problem. 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 were given a complex coding or system problem with incomplete requirements or no obvious path forward. How did you structure your thinking, communicate your approach, and drive it to a result?