Hello, I'm confused as to why I can't add augury for my divination wizard, it allows me to do so in Roll20 but doesn't appear in the spell list for my wizard. Is augury not allowed for a divination wizard? That would seem a little strange considering that's the entire theme of the subclass and the fact that I'm able to do so on roll20. I enabled all optional class features so I don't think it's a technical issue. Any feedback would be appreciated, thanks!

Roll20 is not an official site for D&D rule adherence. Just because it lets you do something doesn't mean it's in the rules. 

Augury is not on the Wizard spell list. 

Tasha's Cauldron of Everything book allows for optional extras for classes, which does expand some spell lists and would add Augury for wizards. You will need that book purchased on here and then enable tasha options in the Home tab of the character builder and then in the class tab use the tasha section and click the checkbox. 

Thank you! It just kind of annoyed me like how Lunar sorcerers don't get moonbeam.