Joseph said in a revelation Michael had "the keys of salvation."
Section 78:16, Doctrine and Covenants, The Church of Jesus Christ of Latter-Day Saints, accessed February 8, 2022
16 Who hath appointed Michael your prince, and established his feet, and set him upon high, and given unto him the keys of salvation under the counsel and direction of the Holy One, who is without beginning of days or end of life.