In the 20th century, Haile Selassie sought to link Abyssinia with this ancient and revered identity. His motivation was largely driven by religious and ideological reasons—by associating Abyssinia with the biblical Ethiopia, he aimed to give his Christian empire a divine legacy and strengthen its legitimacy, especially in the eyes of both his people and the international community. As a result, Abyssinia officially changed its name to Ethiopia.....This is what the Debatera historians were and still are trying to resist to accept.
As for Eritrea, if you consider its geographical and historical boundaries, the entire Afar (Afari) territory is an integral part of Eritrea.