For two days now, our TestFlight builds have been unable to launch on a device. What is unusual is that: I can see no crash reports in the Xcode Organiser The console output from a device shows little information Our previous TestFlight build 3.43 worked with no issues. If I make a build with the same code but only changing the version name & version code, the app crashes. Our adhoc distributed app launches fine Some information I do see, but unsure whether it is pertinent or not, is default 10:22:09.228580+0100 kernel AMFI: '/private/var/mobile/Containers/Data/Application/<uuid>/tmp/<uuid-2>' has no CMS blob? default 10:22:09.229105+0100 kernel Unable to send CoreAnalytics event. Delaying for 1000 u.s. to see if the queue drains. default 10:22:09.228760+0100 kernel AMFI: '/private/var/mobile/Containers/Data/Application/<uuid>/tmp/<uuid-2>': Unrecoverable CT signature issue, bailing out. default 10:22:09.228811+0100 kernel AMFI: code signature validation failed. <... lot more logs> [app<{our.bundleid}({uuid-3})>:10098] termination reported by launchd (0, 0, 256) How can I further debug what is going on?