Ive added in ConfigOverrideItemCraftingCosts=(ItemClassString="PrimalItemStructureRewardVaultC",BaseCraftingResourceRequirements=((ResourceItemTypeString="PrimalItemResourceThatchC",BaseResourceRequirement=1.0,bCraftingRequireExactResourceType=false),(ResourceItemTypeString="PrimalItemResourceWoodC",BaseResourceRequirement=1.0,bCraftingRequireExactResourceType=false))) under GameUserSetting.ini under the Expert tab but it isnt having any effect in game. What am I doing wrong?

Putting that into the wrong ini. That should go into the Game.ini