```dart
Future<void> signOutGlobally() async {
  final result = await Amplify.Auth.signOut(
    options: const SignOutOptions(globalSignOut: true),
  );
  if (result is CognitoCompleteSignOut) {
    safePrint('Sign out completed successfully');
  } else if (result is CognitoPartialSignOut) {
    final globalSignOutException = result.globalSignOutException!;
    final accessToken = globalSignOutException.accessToken;
    // Retry the global sign out using the access token, if desired
    // ...
    safePrint('Error signing user out: ${globalSignOutException.message}');
  } else if (result is CognitoFailedSignOut) {
    safePrint('Error signing user out: ${result.exception.message}');
  }
}
```