I want to activate the miracle from the DLC, the Miracle of Greater Zimbabwe. In the game itself, in the additional content section, it says that: I do not have access. I was told that I need to get this in the rewards on the g2g site, but I can’t find it in any way, someone help.

Have you already subscribed to the Newsletter, via the Link in this post: https://www.games2gether.com/amplitude-studios/endless-space-2/blogs/798-amplified-22-kicking-off

You'll need to do that, to unlock it in your rewards page.