The Thirteenth point summarizing my longer explanation of the PMW says this:
When the statement says, “Extending calls to teachers who have spiritual care of children in Christian schools is not merely a laudable custom, but is in accordance with Romans 10:14-17 and Augsburg Confession XIV,” it does not mean that Romans 10:14-17 or AC XIV apply directly to the circumstance of teachers in Christian schools. Instead, it means that these citations establish the principle that anyone who teaches God’s Word on behalf of the Church must be authorized by the Church to do this. That authorization is what the statement means by a “call.”
The application of these references to teachers in Christian Day Schools, Sunday School teachers, etc., has caused great concern and even alarm among ELS theologians. These references concern themselves with the office of the public ministry in the narrow sense, as established by Jesus when He commissioned and sent His apostles, but the PMW relates them to all the wider-sense offices too.
Yet the words “in accordance with” do not really mean that these references apply directly to all the wider-sense offices. Instead, the words “in accordance with” mean that the arrangement by which the Church confirms the authority of narrow-sense ministers, described by these references, is also an appropriate model for confirming the authority of those who serve in offices created by the Church.
The PMW also uses the word “call” for that arrangement. This must be kept distinct from the call to the narrow-sense office, which God Himself has commanded and established for the benefit of His Church. In the case of other wider-sense offices, a “call” refers to the authorization of the Church, which created the offices. Yet this authorization also carries the authorization of God, since He allows the Church to create these offices. (It may help to read my longer explanation of the term “limited public” to see how this distinction is expressed in the PMW.)
You may have to read the above more than once, because it’s written in long, moderately complex sentences. If that causes you grief, sorry. As always, I’d be happy to answer your questions about this point.