Thank you. It seems obvious now, but after days of googling it wasn’t.
the ‚Enable App Sandbox : Yes‘ does not apply to iOS. It‘s needed for macOS apps.
I was stuck at level 1, but am now turned up to 11.
OnionHair
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I set Build Settings: Signing: 'Enable App Sandbox' to 'No' . It works again. I had this problem suddenly after days of a functioning app, sandbox functioning for days before suddenly not.
Same problem here.