'Unable to fetch remote config. Cached or default values will be 'used' flutter

Question

I have setup firebase config for flutter

According to documentation https://pub.dev/packages/firebase_remote_config#-readme-tab-

My key is

then I have Published also then i tried following code and it will return

'Unable to fetch remote config. Cached or default values will be ''used'

could you please point issue

I have tried those also

Firebase Remote Config - Initial fetch return local default values

Remote config in Flutter app throws exception on fetch

try {
              remoteConfig.getString('welcome')[![enter image description here][1]][1]
              // Using default duration to force fetching from remote server.
              await remoteConfig.fetch(expiration: const Duration(seconds: 0));
              await remoteConfig.activateFetched();
     } on FetchThrottledException catch (exception) {
              // Fetch throttled.
              print(exception);
    } catch (exception) {
              print(
                  'Unable to fetch remote config. Cached or default values will be '
                  'used');
}

Solution

This worked fine for me,

    await remoteConfig.ensureInitialized();