Actually, the Jews were using the 22 book canon (our 39 OT books) in the intertestamental period, and the NT canon was established in common use by around 200 AD, so universal use of the 66-book Bible dates to around the turn of the 3rd century AD.
wrong, wrong, wrong. the Septuigant was the OT of the early Church and it contained more than your 39 books. there was no “common use” of the NT, many books claimed to be Scripture and certain books like Revelation were not accepted by everyone. The Church settled the question in the 4th century, and did not come up with 66 books.
please provide me the name of any group before the 16th century that used a 66 book Bible, i have never heard of any. The One, Holy, Catholic and Apostolic Church has never used a 66 book Bible. 1,500 years is a long time to have the wrong Scriptures, don’t you agree?