Can not install TestFlight version: "This app cannot be installed because its integrity could not be verified."

Hi,

I created an application for a client. The client put me as a developer in his team on AppStore Connect. For that I use the tools of Apple with Xcode. The application is in Swift. Really the classic application with the Apple stack. I built the app with no problem. I tested it on my iPhone. No worries there either. From Xcode I made an archive and uploaded it to TestFlight. The archive has been received by Apple. It was then processed by Apple. And finally I received a notification that it was available on TestFlight.

TestFlight offers me to install it but when I try it does not install it. And if I try to click on the icon of the application it shows me the message "This app cannot be installed because its integrity could not be verified." I have tried installing other apps from TestFlight and have no issues. I checked on my mac for the various certificates for this client and they are all good and valid.

I don't understand why on this application I have this behavior.

Someone would have any idea ?

Regards

Tof