Problem scenario
In AWS you find some components, such as a Security Group, has an owner. You cannot find the owner in IAM. How do you learn more about this user?
Solution
The owner is not an IAM user. In the AWS Console, go to Support -> Support Center. Search for the owner number there. You may have different account aliases. If you log into each one, eventually you will find the owner number matches with what you see in Support -> Support Center.