Christ came to heaven from earth, where He functioned as the angel of Yahweh. He approached the throne of God, and was presented to Him. The presenting official or officials are not mentioned by name. For this occasion we can place Michael, the archangel here. Perhaps also Gabriel, the kings' herald is also involved.
Dominion is authority to rule.
This is specific authority to rule over planet earth. The first Adam surrendered that authority with his sin of abrogation of responsibility. He gave up the earth to be like the woman in sin. The last Adam, Jesus Christ, came to earth to retake that authority. However, in order to exert His authority, Christ must have the assent of the ruled.