I encountered the same error "apple/apple/game-porting-toolkit 1.0.2 did not build" while attempting to build it using the guide provided by applegamingwiki for the apple porting toolkit. However, I managed to resolve the issue by following these steps:
Delete the appstore Xcode and beta 3 Xcode.
Uninstall the beta 3 Xcode command line tools.
Install beta 2 Xcode along with the corresponding command line tools.
Remember to restart your system after completing the installation.
By following these steps, I was able to successfully overcome the error and proceed with the build process.
amfxc
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I have a similiar issue. No audio when using airplay from MBP 2016 (Mojave) to Apple TV 4K tvOS 14.
Using airplay for video from iPhone 11 Pro Max running Beta 5 to Apple TV 4K tvOS 14 works fine though.