After several days I've found the bug! Unintentionally I started the CarPlay App on the Simulator after I started a new debug build on iPhone in Xcode. But I missed, that Xcode showed an error, so I was launching the CarPlay App without having the debug process attached to Xcode. And suddenly everything works as expected. I can now reproduce it every time when I'm launching a new debug build from Xcode. My workaround is to launch the new build, stop it and launch the App on CarPlay. Anyway, debugging code is always possible so I never had the idea, that there is an issue. Only the CPNowPlayingTemplate isn't working while debugging.

No, unfortunately these are also not updated.

In Xcode go to Product -> Xcode Cloud -> Manage Workflows. Select General in the top left and find the checkbox "Restrict editing". This checkbox has to be selected to make TestFlight distribution possible.

Good morning, I don't have any solutions at the moment but we're noticing the same problem. The error occurs on all of our extension targets like Widget, Watch Extension and NotificationService/-Content. I downloaded the archive to compare it with a locally built target. It's missing the embedded.mobileprovision file in the app folder as well as in the plugins folder. So this was the only difference I could notice. Also it doesn't change anything if you sign the app automatically - usually we use manual signing build settings. I'm also interested in any recommendations. Best Sven