Xcode Environment Variables Not Present During Archive
Environments variable are set only if you run the app from Xcode. If you run the same app from the device directly by tapping the icon, they won't be set. They are not part of the app. As their name imply, they are part of the environment, that Xcode sets up specifically before running them. (If you were developing on the Mac, you could set them in a shell before launching an executable, but that is not possible on the iPhone.)