Much more can always be said about this pretty vast topic, but there are a couple of past answers that should help:

Henry IV owned an English Bible which was illegal for laypeople to own. How risky was this possession for him politically? Could he have been accused of heretical tendencies? Why would he have this if he was latin literate? by u/sunagainstgold

and I'm a layperson in medieval Europe. What kind of access does the Church want me to have to the Bible? by me

Very briefly the problem wasn't really about translating the Bible in non-Latin vernaculars in general, as long as it was by/with the approval of the church. They didn't want random translators to misunderstand things and possibly mislead people,