Does the "PhraseListGrammar Class" from the Azure "Speech Service" just work when using US english as the speech recognition language?

Question

I'm setting up an application for Android using Unity, where I want to apply speech to text functionalities, for that purpose I'm using the SDK of Azure's Speech-Service. The problem is that when I say a word, the recognizer tries to guess the word instead of even considering what I was saying, for example when saying pseudowords.

That's why I wanted to implement the Phrase List, which it's suppose to help you improving the accuracy of speech recognition.

So I used the PhraseListGrammar Class, and it was working well when using "en-US" as the SpeechRecognitionLanguage but when I try to do the same when using "en-ES" it just omits all the phrases added and the problem persist for all the other languages, perhaps there's something I'm doing wrong.

Yesterday I was trying this and it was working like a charm when using "en-US", now it's not working so there must be something missing.

    var config = SpeechConfig.FromSubscription("mysubscriptionkey", "westus2");
    // config.SpeechRecognitionLanguage = "en-US";
    config.SpeechRecognitionLanguage = "es-ES";
    config.OutputFormat = OutputFormat.Detailed;

    using (var recognizer = new SpeechRecognizer(config))
    {
        lock (threadLocker)
        {
            waitingForReco = true;
        }
        PhraseListGrammar phraseList = PhraseListGrammar.FromRecognizer(recognizer);
        phraseList.AddPhrase("Mover un badodo");
        phraseList.AddPhrase("lolololalala");
        phraseList.AddPhrase("badodo");


        var result = await recognizer.RecognizeOnceAsync().ConfigureAwait(false);

        if (result.Reason == ResultReason.RecognizedSpeech)
        {
            consoleMessage = JsonConvert.SerializeObject(result.Best());
            newMessage = JsonConvert.SerializeObject(result);
        }
        else if (result.Reason == ResultReason.NoMatch)
        {
            newMessage = "NOMATCH: Speech could not be recognized.";
        }
        else if (result.Reason == ResultReason.Canceled)
        {
            var cancellation = CancellationDetails.FromResult(result);
            newMessage = $"CANCELED: Reason={cancellation.Reason} ErrorDetails={cancellation.ErrorDetails}";
        }

        lock (threadLocker)
        {
            cmessage = consoleMessage;
            message = newMessage;
            waitingForReco = false;
        }
    }

I expected it to improve the recognition of the added keywords, but It's not working.