Hello. Saying hello first is always appreciated.

These errors are produced by the Unity il2cpp compiler. The build logic of this step is determined by Unity itself, not by this builder. The il2cpp compiler step is a kind of "blackbox" to this builder.

The first thing to check is this. Does the *same* Xcode project build successfully with the *same* iOS SDK on macOS ?

If yes, then I have to fix it - possibly through a compiler upgrade. If no, then Unity has to fix it (at least for this Unity version/iOS SDK version combination).

Thank you for checking this first.