iOS app won’t run on device any more under iOS 12: Unrecoverable CT signature issue

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I’m not sure if this will fix it for everyone, but I had the exact same problem and it solved the problem for me. In Keychain Access, I set the trust settings to “Use System Defaults” for the following certificates:

  • Apple Worldwide Developer Relations Certification Authority
  • Developer ID Certification Authority
  • iPhone Developer: {email}
  • iOS Distribution

Some of them were set to “Always Trust” before, and changing it seemed to resolve the issue. When running Xcode however, it initially still did not work, so I cleaned the build and restarted Xcode, and the application finally launched.

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