In first century Jerusalem there were at least four OT Canons in use by different Jewish Groups. There was the Canon of the Pharisees, the Sadducees, the Ethiopian Jews and the Diaspora/Essene Jews. Jesus and the disciples used the Septuagint which was the Canon of the Diaspora/Essenes. We know this because it is quoted in the New Testament. This Canon continued to be the Canon of Christians until after the Reformation and, in fact until about 200 years ago when the Protestants adopted a condensed version of the Canon eliminating the Deuterocanonicals from their Bibles. Even the AKJ originally contained the complete Christian Canon. It has been said by critics of Christ’s Church that the Deuterocanonicals were never believed to be inspired and just the opposite is true. The decision by Christians as to which books are inspired and useful for teaching was decided at the African Synods in the late fourth and early fifth century. There was never a question about their inspiration.
The OT Canon chosen by the Protestants is actually a Jewish Canon not chosen by the Jews until after the establishment of Christianity as a result of the spread of Christianity to slow the growth of the new group in Jerusalem after the fall of the Temple in 70AD. Until then as I said previously there were many Canons in use. The adoption of the Canon missing the Deuterocanonicals united the Jews against the Christians was decided in the Jewish Council of Jamnia because the Deuterocanonicals referred too strongly to the Messiah fulfilled in Christ.
Some Protestants will claim that only the Jews have the authority to choose Canon but the Church deferred that decision to Christ and the disciples and it is clear through biblical research, that the Septuagint is the Bible used by the first century Church and quoted in the NT Scriptures. The fact that Protestants choose to adopt the Canon that was approved by the same Jews that accused our Lord that resulted in His crucifixion suggests the source of this confusion as from the father of lies who led the Pharisees to accuse Christ and petition for His punishment. It is another way that Satan divides the body of Christ and separates the faithful denying Christ’s prayer that we all be one in Christ through His Church. The Christian Church has always used the Septuagint as Canon and never the truncated version of modernist Protestants.
Some Protestants erroneously believe that Catholics added to the Bible with the Deuterocanonicals but this shows an ignorance of their own history and the history of Christianity as witnessed by Christ’s Church. The facts are that the Protestants removed the Deuterocanonicals and even considered strongly to remove some of the NT books currently in use by Protestants and Catholics. Fr. Martin Luther was in favor of removing the book of James because it conflicted with His heretical man made doctrines of the “Solas”, Sola Scriptura and Sola Fide. The heretic Ulrich Zwingli wanted to remove the Gospel of John because of its teaching of the commandment to Eat Christ’s Body and drink His Blood which contradicted his view of a real absence of Christ instead of a real presence in the Eucharist. Even Fr. Martin Luther could not endorse such a departure from Scriptures and deny that Christ is truly and really present in the Eucharist in Body, Blood, Soul and Divinity.