I've uploaded my app to the App Store. I created a closed testing track following the documentation, but I'm not sure why there are two closed testing tracks: Alpha and another one I created called Test. I’m unsure if both are required, but I’ve added email lists to both of them.

Now, I have been stuck on just one user currently opted in. I shared the link I got from the tester tab, but I am unsure exactly how a user should opt in. This is confusing. I reached out to all the testers, and everyone has the app installed, running, and testing. I can't go further than this. What can I do next?