Was Umm Haram a Mahram to the Prophet ﷺ? What is the more correct view with decisive evidences?

Assalamualaikum, Was Umm Haram a Mahram to the Prophet ﷺ? What is the more correct view with decisive evidences? I have seen some say he was given a special privilege, but this was refuted by qadi iyad. Some others say she was his mahram, but this also had its nuances. Which is the more correct opinion and why? JazakAllah khair.