If I can cut in here, I'd like to mention that the doctrine of Apostolicity is understood differently in different church bodies. What's being talked about above is the doctrine of Apostolic Succession which belongs to the theological frameworks of the Eastern Orthodox, Roman Catholic, and Anglican, broadly speaking.
Parts of the Lutheran Church has Apostolic Succession, but this is not what it means to be Apostolic according to our doctrine. That is, when we confess in the Creed that we believe in one holy catholic and apostolic Church, the Church is called Apostolic not because of succession or transmission of divinely instituted authority - but rather because it’s built on the foundation of the apostles and prophets, with Christ Jesus as the Cornerstone. It’s also Apostolic given its doctrinal and historical connection with the Apostles, and that it continually sets forth the doctrine of the Apostles, remains steadfast in the teachings, and carries the Apostolic mission of preaching the Gospel to the whole world.
In simple terms: The more accurately a church body proclaims the Gospel, in equal proportion it is Apostolic. Or to put it a different way - it's quite possible for a church body to have Apostolic Succession, but no Gospel, which does not make them Apostolic.
We believe and teach that the true catholic and apostolic Church is wherever the Gospel is rightly preached, and the Sacraments rightly administered.
