Vertex AI SDK not working on Firebase Cloud Functions

[quintusvw-jvs]

I'm trying to use the vertex-ai sdk on my Firebase Function, but keep getting the below error (a very vague message as this does not tell me what the issue is - there is no stack trace, this is the only error I receive in the Logs Explorer on GCP):

GoogleGenerativeAIError: [VertexAI.GoogleGenerativeAIError]: exception posting request to model at /workspace/node_modules/@google-cloud/vertexai/build/src/functions/generate_content.js:49:15 at processTicksAndRejections (node:internal/process/task_queues:96:5) at async generateContent (/workspace/node_modules/@google-cloud/vertexai/build/src/functions/generate_content.js:39:22) at async /workspace/lib/api/prompt.js:22:21

The code that I'm trying to run (a simple test):

const {onRequest} = require("firebase-functions/v2/https");
const {setGlobalOptions} = require("firebase-functions/v2");

import { VertexAI } from '@google-cloud/vertexai';

setGlobalOptions({ region: "australia-southeast1" });

exports.promptTest = onRequest({cors: true}, async (request, response) => {
  const vertex_ai = new VertexAI({project: 'my-project-id', location: 'australia-southeast1'});
  
  const model = 'gemini-1.5-pro-preview-0409';

  const generativeModel = vertex_ai.preview.getGenerativeModel({
    model: model
  });

  const prompt = `Give me an idea for a camping trip`;
  const req = {
    contents: [{role: 'user', parts: [{text: prompt}]}],
  };

  const content = await generativeModel.generateContent(req);

  const result = content.response.candidates.at(0).content.parts.at(0).text;
  response.send(result);
});

I have enabled all the Vertex AI API components on my GCP account and have tested using the cloud CLI (it worked as expected).

API_ENDPOINT="australia-southeast1-aiplatform.googleapis.com"
PROJECT_ID="my-project-id"
LOCATION_ID="australia-southeast1"
MODEL_ID="gemini-1.5-pro-preview-0409"

curl \
-X POST \
-H "Authorization: Bearer $(gcloud auth print-access-token)" \
-H "Content-Type: application/json" \
"https://${API_ENDPOINT}/v1/projects/${PROJECT_ID}/locations/${LOCATION_ID}/publishers/google/models/${MODEL_ID}:streamGenerateContent" -d '@request.json'

When I try catch my code, I get the following error: 

jsonPayload: { name: "GoogleGenerativeAIError" stack_trace: { } }

I hope somebody can assist me.