iOS App Won't Run on Device Any More Under iOS 12: Unrecoverable Ct Signature Issue

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

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.

Native iOS app built in Xamarin/Visual Studio opening then instantly closing

Found the answer. Had to set the system certificate trust from "Always Trust" to "Use System Default". Same solution as provided here: https://stackoverflow.com/a/52506186/9704484

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