Was able to solve the problem.
This problem was caused by macOS 15.0, which I already installed. It did not matter, which xCode version I used. So I organized a cloud access to a Mac (with macOS Sonoma and xCode 15.4) (https://www.macincloud.com), cloned the project from GitHub and archived and sent it to Apple Store connect again. Now, was able to send it to Apple to check it.
Pascal2807
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Was able to solve the problem.
This problem was caused by macOS 15.0, which I already installed. It did not matter, which xCode version I used. So I organized a cloud access to a Mac (with macOS Sonoma and xCode 15.4) (https://www.macincloud.com), cloned the project from GitHub and archived and sent it to Apple Store connect again. Now, was able to send it to Apple to check it.
Same problem here after updating to Xcode 16 and downgrading afterwards
Maybe, we need to install an older macOS? https://forums.macrumors.com/threads/xcode.2428826/