I have been developing iOS apps for more than 3 years now. One of my clients installed the app via TestFlight in early 2021 on his iPhone. Now that he has changed his phone, I tried to add him to the TestFlight app again, but he didn't receive the invitation or couldn't install the app. In TestFlight, it is displaying that he installed the app version in early 2021 on his old iPhone.
I think for the new iPhone, he needs to accept the invitation, but there is no way to send an invitation to the TestFlight app. Has anyone experienced this issue before?