here is my process. I had download the sample project "juice" open project by Xcode 12.1 create new Identifiers & Profiles ,Enable sign in with apple Return Xcode and Build and Run. I had try sign in by Apple ID, but Sign Up Not Completed message is appear. I see an error message "AKAuthenticationError Code=-7034" Use my friend's develop account to create new Identifiers & Profiles ,Enable sign in with apple set bundle id ,Return Xcode and Build and Run, try sign in is success. Two create process is same, Certificates has been installed ,What's wrong please help me.