I am experiencing the same thing. I have a live app on the App store. But when I create a new version for update, and try to install the TestFlight app for testing, I get the message "Could not install [app name]. The requested app is not available or doesn't exist". I have also opened a support case. Please let me know if you learn anything. Thanks!

I am experiencing the same thing. I have a live app on the App store. But when I create a new version for update, and try to install the TestFlight app for testing, I get the message "Could not install [app name]. The requested app is not available or doesn't exist". I have also opened a support case. Please let me know if you learn anything. Thanks!