iOS Signing Overview
You need to have your iOS Certificates and Provisioning Profiles ready to be able to build and deploy your applications to Apple Appstore.
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For app builds, signing identities are not mandatory. For example, you can use unsigned apps to run on the simulator or on third-party platforms that resign your app, such as AWS Device Farm.
However, unsigned binaries cannot be installed on actual devices; therefore they cannot be used in the Appcircle Testing Distribution.
You can obtain your developer certificates and provisioning profiles from the Apple Developer Portal:
Code Signing Resources | Apple Developer ForumsNo description availabledeveloper.apple.com