Build settings - unrecognized key (DeveloperURL)

Hi there

In 2018, I got a recommendation on this forum about using settings.osx.plist.DeveloperURL in build settings (topic in context ) but now I’m getting a “unrecognized key” warning about it in Corona Simulator. 

Is this normal since I’m viewing the application currently in iPhone X in the simulator or has this key been deprecated? Is there a definitive list of supported key for build settings file available somewhere? 

Does anyone know of a documentation with a complete list of supported keys for build settings? 

Are you building for macOS or for iOS?