Why I call the GetMeetingUIWnd interface and return the values firstViewHandle and secondViewHandle always null

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Similar to this problem, have you solved it？

how can I use public SDKError GetMeetingUIWnd(ValueType hFirstView, ValueType hSecondView) to get the window handle of Meeting UI?

what arguemtns should I pass to the public SDKError  GetMeetingUIWnd(ValueType hFirstView, ValueType hSecondView)  and what’s the returned result?