BuildPatchTool for Mac: Provided launch executable file was not found within the build root

When using the BuildPatchTool for my Mac build, I’m encountering the following error:

Provided launch executable file was not found within the build root. <game name>.app

The same BPT command works for Windows and even for Linux, so I think the problem is that the .app file is not being recognized as an executable. Windows displays .app files as a folder, so I know that it’s different from an .exe or a .x86_64.

However, my game works on Steam on Mac when I mark the .app file as the executable, so I think that’s the correct way to do it. Does EGS have a different way of handling Mac builds?

I solved the problem by contacting Epic staff. Their reply:

If your BuildRoot is the folder above the .app, then your AppLaunch argument should be:
GameName.app/Contents/MacOS/GameName

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