Hey, i just go the FaceAR Sample working in a packaged build 4.27. First of all you have to make sure everything works fine in the editor. Then for me what it took was :
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Creating a LiveLinkPreset and setting it to the Default Live Link Preset in Project Settings > Live Link like @TommasoKB suggested
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CLOSE THE EDITOR WHEN YOU LAUNCH YOUR EXECUTABLE. You can only have 1 LiveLink “instance” working. Standalone Play is therefore not compatible because you have the Editor + Standalone.
I didn’t have to add -messaging to my executable. Don’t know why.
Also helpful to debug LiveLink connection is the console command : “LiveLink.ShowDebugInfo”. It show nothing when no subject are connected but the moment my iPhone is detected it shows in the bottom right corner of the screen.