Following the Mosasaurus tournament, we are seeing an issue similar to the "archelon incident". Those who finished in the top 1% in dominator league win their Mosasaur, but it fails to unlock it the market. If you are one of those who is experiencing this problem, rest assured, you're not the only one. Many people have posted about having this problem on JWTG's Facebook page. Ludia says they are currently "looking into the issue". I will update this post with the latest information as soon as it becomes available.