@Andrew (Digitwell)
Thank you for the hint. I will check it
About TestFlight require anything:
I have setup TestFlight to use the Apple default App / App Store License Agreement.
Additionally:
I am in touch with the Apple Support. It seems that something is wrong. In AppStore Connect I only see my App version which I developed with Xojo some years ago.
My build with B4X I only see in TestFlight but not in the "App Store" tab.