The bug report usually reads something like this: "Play Console says 9 testers. 14 people installed the app. What's broken?" Nothing is broken. Play Console doesn't count installs. It counts people who opted in to your closed testing track with a Google account, and those are two different groups. The gap is almost always explainable, and usually fixable in an afternoon. On a personal developer account created after November 13, 2023, that gap matters. You need at least 12 testers opted in...