Could not add AzureOpenai Embedding Model Connector with AWS OpenSearch Serverless. Facing 503 DNS resolution failure

Plugins Machine Learning
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
AWS OpenSearch Serverless
(Codebase ran from my local mac)

Describe the issue:
This is my codebase,

from requests_aws4auth import AWS4Auth
import boto3
import requests
import os
from dotenv import load_dotenv

load_dotenv()

# AWS Credentials
service = 'aoss'
region = '<Region>'
credentials = boto3.Session().get_credentials()
awsauth = AWS4Auth(credentials.access_key, credentials.secret_key,
                   region, service, session_token=credentials.token)

# Collection Endpoint
host = "XXX"

### Create connector for Azure OpenAI embedding model ###
# Register repository - Creation of connector
connector_path = '_plugins/_ml/connectors/_create'
connector_url = host + connector_path
# Define the payload for Azure OpenAI Embedding model Connector
connector_name = "azure-openai-embedding-text-3-large"
connector_description = "Connector to Azure OpenAI Embedding API"
connector_version = "1"
protocol = "http"
payload = {
  "name": connector_name,
  "description": connector_description,
  "version": connector_version,
  "protocol": protocol,
  "parameters": {
    "endpoint": os.getenv("AZURE_OPENAI_ENDPOINT"),
    "deploy-name": os.getenv("AZURE_OPENAI_EMBEDDING_DEPLOYMENT"),
    "model": os.getenv("AZURE_OPENAI_EMBEDDING_MODEL"),
    "api-version": os.getenv("AZURE_OPENAI_EMBEDDING_API_VERSION")
  },
  "credential": {
    "secret_key": os.getenv("AZURE_OPENAI_API_KEY")
  },
  "actions": [
    {
      "action_type": "predict",
      "method": "POST",
      "url": "${parameters.endpoint}/openai/deployments/${parameters.deploy-name}/embeddings?api-version=${parameters.api-version}",
      "headers": {
        "api-key": "${credential.secret_key}"
      },
      "request_body": "{ \"input\": ${parameters.input}}",
      "pre_process_function": "connector.pre_process.openai.embedding",
      "post_process_function": "connector.post_process.openai.embedding"
    }
  ]
}

headers = {"Content-Type": "application/json"}

r = requests.post(connector_url, auth=awsauth, json=payload, headers=headers)
print(r.status_code)
print(r.text)

Output

503
DNS resolution failure