Hi Muneeb.
This has been broken since I joined the company, thank you for bringing it up, we are looking at solving it in a holistic manner. When you specify a CreatorName without specifying a CreatorType, and there is a User and Group that exactly matches that name, we will only return you the creations made by the User. In many cases, the User has not created anything, which is why you get no results. The way to get around your issue is to specify a CreatorType = Group in the CatalogSearchParams, but I understand that currently it is not supported. We will work on a fix to update engine and the documentation, you would just need to update your studio / game-engine version when that is ready. Thank you for your feedback.