I'm working on a Text-To-Speech & Speech-To-Text based app. App is working fine on almost all device. But when I'm trying to use this on TV, it is giving me error "TTS Initialization failed!". I tried multiple apps from Github but this device is giving same error.

But when I tried to use T2S app from Google Play Store: https://play.google.com/store/apps/details?id=hesoft.T2S&hl=en_IN&gl=US. In T2S, both TTS as well as STT are working in my TV but none of those working in my app on same TV.

textToSpeech = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
            @Override
            public void onInit(int status) {
                if (status == TextToSpeech.SUCCESS) {
                    int ttsLang = textToSpeech.setLanguage(Locale.UK);

                    if (ttsLang == TextToSpeech.LANG_MISSING_DATA
                            || ttsLang == TextToSpeech.LANG_NOT_SUPPORTED) {
                        Log.e(TAG, "The Language is not supported!");
                    } else {
                        Log.i(TAG, "Language Supported.");
                        ttsOk = true;
                    }
                    Log.i(TAG, "Initialization success.");
                    textToSpeech.setOnUtteranceProgressListener(new UtteranceProgressListener() {
                        @Override
                        public void onStart(String utteranceId) {
                            //speechRecognizer.stopListening();
                        }

                        @Override
                        public void onDone(String utteranceId) {
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    startListening();
                                }
                            });
                        }

                        @Override
                        public void onError(String utteranceId) {

                        }
                    });
                } else {
                    Toast.makeText(getApplicationContext(), "TTS Initialization failed!", Toast.LENGTH_SHORT).show();
                }
            }
        });