Check your closed testing opt-in link
The link your testers open to join the test has a precise shape. Paste it: we check its shape and its package, without sending anything to a server.
The result shows here.
What the tool cannot see
A well-formed link can still fail: the app is not published on the track, the tester is not in the group or the email list, their country is not on the track, or they are signed in to the Play Store with another Google account.
A link that works, and 12 testers to open it.
Get my testers