I have made a Flutter app, and added multiple builds (version 1.0.0, and 1.0.1) but both versions are visible on TestFlight for my internal users, but they can't install the app. On clicking install, this message is displayed: "Could not install App. The requested app is not available or doesn't exist."

There is no issues or problems in the build, I even get the email from Apple that the build can be tested now, but it doesn't happen. Pls help.

I made the build via XCode, and Transporter, but both ways, the build was not able to install on any of the devices. Only this error every time: "Could not install App. The requested app is not available or doesn't exist."