Google Speech-to-Text does not transcribe in multiple languages - Stack Overflow

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The google transcription service does not identify multiple languages in the registration. Below is my code. I have used different formats (MP3, MP4 and FLAC) and models. But it still doesn't work. This is just a code variant.

What could be the problem why it does not transcribe in multiple languages?

Code for MP3:

new Promise(async (resolve, reject) => {
    const request = {
        config: {
            encoding: "MP3",
            sampleRateHertz: 16000,
            audioChannelCount: 2,
            languageCode: ["en-US"],
            alternativeLanguageCodes: ["es-ES", "fr-FR", "en-US"],
            useEnhanced: true,
            enableWordConfidence: true,
            enableWordTimeOffsets: true,
            enableAutomaticPunctuation: true
        },
        audio: {
            uri: `gs://${process.env.GOOGLE_CLOUD_STORAGE_BUCKET_SCRIPTOMAN}/multilingual.mp3`
        }
    };

    let [operation] = [];

    try {
        [operation] = await googleSpeechClient.longRunningRecognize(request);
    } catch {
        try {
            request.config.audioChannelCount = 1;

            [operation] = await googleSpeechClient.longRunningRecognize(request);
        } catch (error) {
            reject(error);
        }
    }

    if ([operation] != undefined && operation != undefined) {
        const [response] = await operation.promise();

        resolve(response.results);
    } else
        reject();
}).then(results => {
    console.log(results);
}).catch(error => console.log(error));

Code for FLAC:

new Promise(async (resolve, reject) => {
    const request = {
        config: {
            encoding: "FLAC",
            audioChannelCount: 2,
            languageCode: ["en-US"],
            alternativeLanguageCodes: ["es-ES", "fr-FR", "en-US"],
            enableWordConfidence: true,
            enableWordTimeOffsets: true,
            enableAutomaticPunctuation: true
        },
        audio: {
            uri: `gs://${process.env.GOOGLE_CLOUD_STORAGE_BUCKET_SCRIPTOMAN}/multilingual.flac`
        }
    };

    let [operation] = [];

    try {
        [operation] = await googleSpeechClient.longRunningRecognize(request);
    } catch {
        try {
            request.config.audioChannelCount = 1;

            [operation] = await googleSpeechClient.longRunningRecognize(request);
        } catch (error) {
            reject(error);
        }
    }

    if ([operation] != undefined && operation != undefined) {
        const [response] = await operation.promise();

        resolve(response.results);
    } else
        reject();
}).then(results => {
    console.log(results);
}).catch(error => console.log(error));

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