True as Hawd was actually majority conquered and administrated by isaaq clans in mid 19th and 20th century as the area had little control from Ethiopian or British but it was part of isaaq sultanates that the British signed treaties withSxb you have missed the point.
The AU/UN etc recognise colonial drawn borders and since the Hawd was not part of pre-WWII borders then its difficult to make a case for it over the Ogaden.
Realistically speaking, both Somalia and Somaliland have a decent case for the Hawd and Ogaden equally but not one over the other.