It was kind of the other way around - they were allowed to eat from the tree of life, and were only forbidden from eating from the tree of knowledge. It was only after eating from the tree of knowledge that access to the tree of life was lost because they were exiled from Eden.

It’s just that I guess technically in the lore the tree of knowledge was a one and done thing and the tree of life you needed to keep eating from to gain the benefits.

That must be the one and only inconsistency in the Bible…