When integrating the Automatic Sign-In API on physical devices (iPhone SE with iOS 26.0 and Apple TV with tvOS 26.0), the call to requestAutoSignInAuthorization() results in an immediate error stating "Service temporarily unavailable." This prevents the app from obtaining the necessary authorization context to proceed with token updates and the Automatic Sign-In flow.
The issue occurs specifically at the authorization request stage and does not progress to calling updateAutoSignInToken(), since it does not acquire conditions for it. All entitlement and sandbox setup have been verified and are correctly configured.
Error:
Error Domain=VSErrorDomain Code=3 "The service is temporarily unavailable." UserInfo={NSLocalizedDescription=The service is temporarily unavailable., NSLocalizedRecoverySuggestion=Please try again later.}