Issue with the Apple Connect

Hi,

The Apple Connect works fine for the current version of my app on the App Store BUT when I generate a new app on TestFlight, the Apple Connect doesn’t work anymore whereas I didn’t change anything on it.

→ When I log in, I have the Apple popup saying that I am connected but nothing happens on my app (I remain on the Login screen) whereas I should be redirected to another screen.

Do you have an idea? Has anybody faced this issue?