It’s true that the Augsburg Confession (Article XIV) holds that no one is to preach, teach, or administer the sacraments without a regular call, and I’m sure that there is a belief that a pastor has been called and is being guided and used by God in his ministry. But I don’t think that most Lutherans would claim that a pastor, by reason of his ordination, has some sort of supernatural ability to confect the Eucharist or that ordination, as some Catholics here in CAF have said, leaves an indelible mark on the soul of the person ordained. Ordination, for Lutherans is not a sacrament, and as already noted,
an unordained layman could say the words of institution if the need arose. Lutherans have only two sacraments, baptism and communion (i.e. the Eucharist) and although a pastor usually baptizes and says the words of institution during communion, under extraordinary circumstances, a layman can do both things. Even Catholics believe that in an emergency, anyone with appropriate intention and using the Trinitarian baptismal formula can baptize. Lutherans, I think, believe the same applies to communion where anyone with proper intention and using the right words can say the words of institution for communion.
As noted here:
en.wikipedia.org/wiki/Lutheran_Church%E2%80%93Missouri_Synod
I don’t think that the ELCA is substantially different. We do have bishops in the ELCA who are pastors called to serve either a synod or as Presiding Bishop, but I don’t think that the notion of Apostolic Succession is important and after his or her term of service, a bishop returns to just being a pastor.