OKRs are just a tool to help frame the future state you want (the objective) and how you define you reached this future state (the key results).
So it's OK if your objective is not a validated problem. Write it down in a standard way. Then you can adjust your early key results and focus on deciding if the objective should be a goal you keep focusing on.
Reaching conclusions so you can make your product and strategy move forward is the priority. Early and cheap experiments will be the key!
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