The Unity side of an iOS build is close to a non-issue — install the iOS Build Support module, switch platform, done. Every actual failure point is Apple's signing and provisioning system, not Unity.
The one that burns the most time: bundle identifier mismatches. It has to match exactly, case included, across Unity Player Settings, Xcode, and the Apple Developer portal. Set it before you do anything else — changing it later means updating three places in sync, and any drift between them throws "No profiles for [bundle identifier] were found."
Second gotcha: free Apple ID signing expires in 7 days. Fine for a quick test, useless for anything you're actively iterating on. If you're testing daily, the $99/year Developer Program removes the expiry and is worth it earlier than people expect.
Third: IL2CPP is the only scripting backend on iOS — Mono isn't supported due to Apple's JIT restrictions. Unity won't even let you pick Mono for this target, so this one mostly just explains an already-enforced constraint rather than something you can misconfigure.
For the actual "why won't this build" moments — the xcode-select path issue, the untrusted developer prompt, privacy usage description rejections — full error list with fixes here: https://digitaltoolify.blogspot.com/
Anyone building through Unity Cloud Build/Build Automation instead of a local Mac? Curious how much slower the iteration loop actually is in practice.
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