According to a "Wiki" article, the "Formula of Concord" was not unanimously accepted by Lutherans:

Subsequently, it was signed (subscribed to) by three electors of the Holy Roman Empire, twenty dukes and princes, twenty-four counts, four barons, thirty-five free imperial cities, and over 8,000 pastors. These constituted two-thirds of the Lutheran Church in Germany at the time. Every clergyman in the Electorate of Saxony had to either subscribe or write his objections with respect to the Formula of Concord. A rhyme was circulated [at the time]: "Write, dear Sir, write, that you might remain at the parish" (schreibt, lieber Herre, schreibt, dass Ihr bei der Pfarre bleibt).

The Formula of Concord was not accepted by Lutherans in Hesse, Zweibrücken, Anhalt, Pommeranian (Land), Holstein, Denmark, Sweden, Nürnberg, Strassburg, and Magdeburg, and the government of Queen Elizabeth I of England lobbied in its German embassies to prevent acceptance of it among the German estates.

Re: John... It is admittedly an uneducated guess on my part, but perhaps "Concord" doesn't refer to a place but rather the "unity" of Lutherans in regard to doctrine (e.g. 2Cor. 6:15 KJV)?

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simul iustus et peccator

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