I have two different users who have their own apple Account ID, and both of them want to install my app from TestFlight. They can install this app when I send an invitation email to them.
The strange thing is when UserA installed this app, UserB will be removed from my test group and cannot update the newest version. After UserB re-installed the app via the new invitation I sent, UserA will be removed from the test group. It looks like TestFlight regards them as the same account...
The only reason I thought up is the first link I sent to UserA's email (which is also his Apple ID) was taken by UserB (installed on UserB's device login with user B's Apple ID). After that, I invited UserB because UserA wanted to join the test group as well. Then the conflicts happened.
Does anyone know how to separate their accounts? I've been looking for this answer and get nothing to solve this problem....