How to fix "Duplicate Image" error while doing image-editing using GPT Image 1

Hi all,

I am trying to run the following code snippet( for image editing using the Responses API ) as written in the documentation - https://learn.microsoft.com/mt-mt/azure/ai-foundry/openai/how-to/responses?tabs=python-secure#image-generation ||

On passing a single "input_image", this works fine, but on adding multiple images, it shows this error -

Error: 400 Duplicate parameter: 'image'. You provided multiple values for this parameter, whereas only one is allowed. If you are trying to provide a list of values, use the array syntax instead e.g. 'image[]=<value>'.

However, I do not see any "image" parameter being passed here.
Does anybody know what might be happening here?

from openai import AzureOpenAI
from azure.identity import DefaultAzureCredential, get_bearer_token_provider
import base64
client = AzureOpenAI(  
  base_url = "https://YOUR-RESOURCE-NAME.openai.azure.com/openai/v1/",  
  azure_ad_token_provider=token_provider,
  api_version="preview",
  default_headers={"x-ms-oai-image-generation-deployment":"YOUR-GPT-IMAGE1-DEPLOYMENT-NAME"}
)
def create_file(file_path):
  with open(file_path, "rb") as file_content:
    result = client.files.create(
        file=file_content,
        purpose="vision",
    )
    return result.id
def encode_image(file_path):
    with open(file_path, "rb") as f:
        base64_image = base64.b64encode(f.read()).decode("utf-8")
    return base64_image
prompt = """Generate a photorealistic image of a gift basket on a white background 
labeled 'Relax & Unwind' with a ribbon and handwriting-like font, 
containing all the items in the reference pictures."""
base64_image1 = encode_image("image1.png")
base64_image2 = encode_image("image2.png")
file_id1 = create_file("image3.png")
file_id2 = create_file("image4.png")
response = client.responses.create(
    model="gpt-4.1",
    input=[
        {
            "role": "user",
            "content": [
                {"type": "input_text", "text": prompt},
                {
                    "type": "input_image",
                    "image_url": f"data:image/jpeg;base64,{base64_image1}",
                },
                {
                    "type": "input_image",
                    "image_url": f"data:image/jpeg;base64,{base64_image2}",
                },
                {
                    "type": "input_image",
                    "file_id": file_id1,
                },
                {
                    "type": "input_image",
                    "file_id": file_id2,
                }
            ],
        }
    ],
    tools=[{"type": "image_generation"}],
)
image_generation_calls = [
    output
    for output in response.output
    if output.type == "image_generation_call"
]
image_data = [output.result for output in image_generation_calls]
if image_data:
    image_base64 = image_data[0]
    with open("gift-basket.png", "wb") as f:
        f.write(base64.b64decode(image_base64))
else:
    print(response.output.content)