Why the Yaa Naa is the first to know of the death or enthronement of an Asantehene

Yaa Naa Abubakari Mahama II (left) and Asantehene Otumfuo Osei Tutu II
Yaa Naa Abubakari Mahama II (left) and Asantehene Otumfuo Osei Tutu II