can I just use the StartFaceLivenessSession method only the backend for FacialLiveness recoknition

I am doing the sdk implementation, the idea is not to use a front-end but to use only the back-end and send the videos from a s3 bucket, but I have a lot of problems trying to implement the "startFaceLivenessSession", this is what I have:

createFaceLivenessSession:

async function createFaceLivenessSession(): Promise<any> {
  const client = new RekognitionClient({ region: 'us-east-1' });
  const command = new CreateFaceLivenessSessionCommand({});
  const response = await client.send(command);
  return response.SessionId 
}

that works very well and returns the session, and now I am trying to log in with StarFaceLivenessSession like this:

async function startFaceLivenessSessionWithLocalVideo() {
  try {
    const client = new RekognitionStreamingClient({ region: 'us-east-1' });
    const videoFilePath = "/Users/karenortiz/Downloads/video1.mp4"; // Reemplaza con la ruta de tu video
    const videoBuffer = readFileSync(videoFilePath);
    const videoArray = new Uint8Array(videoBuffer);
    const sessionId = await createFaceLivenessSession();
    const input = {
      SessionId: sessionId,
      VideoWidth: "1920", // Ancho del video
      VideoHeight: "1080", // Alto del video
      ChallengeVersions: "v1", // Versión del desafío
      Video: {
        Bytes: videoArray,
      },
    };
    const command = new StartFaceLivenessSessionCommand(input);
    const response = await client.send(command);
    console.log('Respuesta de StartFaceLivenessSession:', response);
  } catch (error) {
    console.error('Error al iniciar la sesión de liveness:', error);
  }
}

it's something very simple because I don't know much about the subject but I have this error:

TypeError: headers[headerName].trim is not a function
    at getCanonicalHeaders (/Users/karenortiz/Desktop/Karen/LivenessSpike/puebaLiveness/node_modules/@smithy/signature-v4/dist-cjs/getCanonicalHeaders.js:20:62)
    at SignatureV4.signRequest (/Users/karenortiz/Desktop/Karen/LivenessSpike/puebaLiveness/node_modules/@smithy/signature-v4/dist-cjs/SignatureV4.js:120:80)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async /Users/karenortiz/Desktop/Karen/LivenessSpike/puebaLiveness/node_modules/@aws-sdk/middleware-signing/dist-cjs/awsAuthMiddleware.js:16:18
    at async /Users/karenortiz/Desktop/Karen/LivenessSpike/puebaLiveness/node_modules/@smithy/middleware-retry/dist-cjs/retryMiddleware.js:27:46
    at async /Users/karenortiz/Desktop/Karen/LivenessSpike/puebaLiveness/node_modules/@aws-sdk/middleware-websocket/dist-cjs/middleware-session-id.js:8:22
    at async /Users/karenortiz/Desktop/Karen/LivenessSpike/puebaLiveness/node_modules/@aws-sdk/middleware-logger/dist-cjs/loggerMiddleware.js:7:26 {

and then I used python and changed my AWS account in case it was a credentials issue but when I use boto3 I can't create a client with start_face_liveness_session().

def start_face_liveness_session():
    """method for create a liveness session"""
    LOGGER.info('START SPIKE FACIAL LIVENESS')
    try:
        video_bytes = download_video_from_s3(bucket_name, object_key)
        if video_bytes is not None:
            session_id = create_face_liveness_session()
            LOGGER.info("session_id:", session_id)
            input_params = {
                'SessionId': session_id,
                'VideoWidth': '1920',
                'VideoHeight': '1080',
                'ChallengeVersions': 'v1',
                'Video': {
                    'Bytes': video_bytes,
                },
            }
            response = client_streaming.start_face_liveness_session(**input_params)
            LOGGER.info("Respuesta de StartFaceLivenessSession:", response)
            return 'OK'
    except ClientError as e:
        LOGGER.info("Error en startFaceLivenessSession:", e)
        return None

so please I need help, I don't know if I'm missing something or if I just can't use only the backend.