Same issue here, but we're getting this error only for our app extension
Failed to verify code signature of /var/installd/Library/Caches/com.apple.mobile.installd.staging/temp.RTMSkO/extracted/Payload/AppName.app/PlugIns/AppName Share.appex : 0xe8008001 (An unknown error has occurred.)
Verify that the Developer App certificate for your account is trusted on your device. Open Settings on the device and navigate to General -> VPN & Device Management, then select your Developer App certificate to trust it.
Just rebuilding the app works to alleviate the issue, however the next time running will give the error again. So every other run it happens. Oh and no developer app certificate is available at the suggested location in the error.
Topic:
Developer Tools & Services
SubTopic:
Xcode
Tags: