Your app uses or references the following non-public APIs:
PrivateFrameworks/MetalTools.framework
The use of non-public APIs is not permitted on the App Store because it can lead to a poor user experience should these APIs change.
Continuing to use or conceal non-public APIs in future submissions of this app may result in the termination of your Apple Developer account, as well as removal of all associated apps from the App Store.
Next Steps
If you are using third-party libraries, please update to the most recent version of those libraries. If you do not have access to the libraries’ source, you may be able to search the compiled binary using the “strings” or “otool” command line tools. The “strings” tool can output a list of the methods that the library calls and “otool -ov” will output the Objective-C class structures and their defined methods. These tools can help you narrow down where the problematic code resides. You could also use the “nm” tool to verify if any third-party libraries are calling these APIs.
There appears to be a fix by wrapping the offending code with an #if !UE_BUILD_SHIPPING flag; this involves building a custom version of the Unreal Engine from source. I haven’t confirmed the fix works though. There’s more info at the pull request I mentioned in my earlier comment.
Your app uses or references the following non-public APIs:
_feedbackSupportLevel
The use of non-public APIs is not permitted on the App Store because it can lead to a poor user experience should these APIs change.
Continuing to use or conceal non-public APIs in future submissions of this app may result in the termination of your Apple Developer account, as well as removal of all associated apps from the App Store.
I haven’t had an issue with 4.21. Can you upgrade your project to the latest version of 4.21 (not always a simple task, I know)? That may fix the issue.
My iOS app just got rejected for this. My project is done with 4.27. The app has been released and continually updated for more than 1 year, since 4.26, and just now I am getting this.
Also, I publish 2 separate apps, with exactly the same backbone, but with different UI and content. One of them got approved for AppStore without any problems. The other one did not