Code signing your app assures users that it is from a known source and the app hasn’t been modified since it was last signed. Before your app can integrate app services, be installed on a device, or be submitted to the App Store, it must be signed with a certificate issued by Apple.
To avoid potential issues with common tasks involving code signing, follow these best practices:
Signing and Running Development Builds
Essential Guides and Documentation
Worldwide Developer Relations Certification Intermediate Certificate update
New Enterprise iOS Distribution Certificates will be issued using a new version of the Apple Worldwide Developer Relations Certification Intermediate Certificate. Apple development certificates will continue to be issued by the version of the Apple Worldwide Developer Relations Certification Intermediate Certificate that expires on February 7, 2023, so you should keep both versions installed on your development systems and servers.
Xcode 11.4.1 or later is required to sign apps using certificates issued with the new intermediate certificate. If you are unable to upgrade to a compatible version of Xcode, you can continue to sign your apps using the command line. Download and install the new intermediate certificate to ensure that you can successfully sign apps with a newly created Enterprise iOS Distribution Certificate.