Pacov just finished watching first 8 minutes. So don't know if you later figure this out but there is a new thing other than just fertility and production called essence. Your start position did not have any essence it would be a blue color and a number after the color. You can only cast enchantments on your city if you have essence. You can cast as many enchantments as you have essence. So if your city has 3 essence, you can cast 3 enchantments on it.
Ah - I did not know that. Thanks!
I wonder if that's covered in the tutorial. I ran through that as well, but don't remember seeing it.