Grant discovered the issue on January 20th while setting up a group FaceTime conversation with his friends for a session of Fortnite. After discovering the issue, Grant and his mom on Twitter and Facebook in attempts to get Apple's attention. (In a Facebook post, the mother said her son wanted an "iPhone X, a MacBook and a new pair of AirPods," for the discovery). They also called and faxed the company, but to no avail. They eventually discovered they needed a developer account to report the bug and did manage to communicate via email with Apple's security team. But the mother and son didn't feel like Apple took the issue seriously until word of the bug started spreading on social media.
Apple has since disabled the group FaceTime feature to prevent any unwanted eavesdropping. Apple does typically offer bounties to developers who discover and report issues, but it's not clear if the Thompsons will be rewarded for their efforts.