Same here in our CI system that authenticates via fastlane: An error occurred saving your changes to the Apple database.	This problem may be a transient issue on the Apple side.	If the problem persists for more than an hour, please contact your iTunes representative. (1129) XCode Version 12.0.1 (12A7300)

For me working again, too. Xcode 12.1 (12A7403) macOS Catalina 10.15.7