W. W. Phelps teaches that angels, including Michael, can only come to earth with the permission of their God.
W. W. Phelps, "Spirits," Deseret Almanac, for the Year of Our Lord, 1854 (Salt Lake City: W. Richards, 1854): 24
One idea further: Good angels and spirits never leave the realms of glory without permission or commission: and when they arrive on the earth, the first salutation is, (if an angel) I am Michael: I am Gabriel: or I am one of thy fellow servants the prophets—worship God. No clairvoyance: no mesmerism: no spiritual rapping: nor no making medicine. No, they come like a God and act like a God.