I'm building a voice app called Moonstone that works like a hands free coding agent for the iPhone. You talk to it and it opens apps, taps through them and gets real tasks done, mostly on a local model running on the phone.
I have the side button access entitlement, an App Intent using the assistant activate schema, and my development profile installed on an iPhone 18 Pro Max on the iOS 27.2 developer beta. The docs say the profile is enough to test during development, but here in the US the Side Button option never shows up in Settings. I tried switching the region to Japan and restarting and it still didn't appear. I filed FB25304176.
Has anyone outside Japan gotten the setting to show up on a development device?