Egg incubater boost. You have to set the temp to the optimal temp for the egg you are hatching. Wyverns are 80-90c so I set temp to 85c and that enabled the
How To Incubate And Hatch Eggs In Ark: Survival Evolved
ARK Survival Evolved: Fertilized Rex Egg - Orcz.com, The Video Games Wiki
Rex egg hatching Ark Survival Evolved PS4 - YouTube