\Engine\Build\IOS\AppleWorldwideDeveloperRelationsCA.pem is out of date.
This causes a warning to appear when submitting app.
Workaround: Install latest WWDR ( https://answers.unrealengine.com/questions/801638/ios-certificate-expired-warning.html )
For certificate inspection only: openssl x509 -in "D:\Epic Games\UE_4.21\Engine\Build\IOS\AppleWorldwideDeveloperRelationsCA.pem" -text
Validity Not Before: Feb 14 18:56:35 2008 GMT
Not After : Feb 14 18:56:35 2016 GMT
For an iOS app build
For iOS app build During upload a warning is displayed in Application Loader stating: Certificate Expired - The signing certificate "CN=Apple Worldwide Developer Relations Certification Authority, OU=Apple Worldwide Developer Relations, O=Apple Inc., C=US" with serial number 25 used to sign Cityloop.app has expired." This is also emailed to the relevant Apple Developer email address.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-67931 in the post.