Engine\Build\IOS includes an expired certificate

\Engine\Build\IOS\AppleWorldwideDeveloperRelationsCA.pem is out of date.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

1. Install your mobileprovision and distribution certificate as normal either via Project Settings > iOS > Import or by using the IPP tool in \Engine\Binaries\DotNET\IOS.
2. Package your app
3. On a Mac, use Xcode > Application loader to submit the packaged distribution .ipa file to Apple's Appstore Connect

Result:

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.

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