In Tafseer Ruh al Maani it is stated clearly...

In Tafseer Ruh al Maani it is stated clearly: "Allamah Alusi stated, Yazeed the impure denied the Prophethood of Rasulullah (s). The treatment that he meted out to the people of Makka, Medina and the family of the Prophet proves that he was a kaafir". Problem is Sunni Islam accepts as a khalifa (literally 'successor' to the Prophet (saws)) a man who clearly did not believe in the Qur'an and instead believed the Holy Prophet (saws) was a fraud. This is part of Sunni doctrine.