If a tester opens your opt-in link and Google Play says the app can't be found, the most common cause is that the Play Store on their phone is signed in with a different Google account than the one on your tester list. The next most common is a closed release that isn't live for testers yet.

On PeerPlay this is one of the first problems testers report. In one paid campaign this month the very first report a tester sent was "please fix your google group, I am seeing content not available." The app was fine. The door to it wasn't. Here is how to find which door is stuck.

What the tester actually sees

The wording varies by device and by where the tester is in the flow. On the Play Store it is often "Item not found" or a message that the app isn't available.…