S3 API: An error occurred (403) when calling the HeadObject operation: Forbidden

import boto3
from botocore.config import Config
creds = {}
# 1. Initialize your client with explicit S3 settings
client = boto3.client(
    's3',
    # For Appwrite Cloud use 'https://appwrite.io'
    # For Self-hosted use 'https://YOUR_HOST/v1/s3'
    endpoint_url=creds.get("endpoint_url"), 
    
    # Credentials mapping for Appwrite
    aws_access_key_id=creds.get("aws_access_key_id"),
    aws_secret_access_key=creds.get("aws_secret_access_key"),
    
    # Must use 'us-east-1' (or a placeholder) so signature signing operates correctly
    region_name=creds.get("region_name"),
    
    # CRITICAL: Force path-style addressing and require standard SigV4 signing
    config=Config(
        s3={'addressing_style': 'path'},
        signature_version='s3v4'
    )
)

# 2. Test your call
try:
    # In Appwrite, 'Bucket' is your Appwrite Bucket ID, 'Key' is your File ID
    response = client.head_object(Bucket="bucketname", Key="filename.json")
    print("Success:", response)
except Exception as e:
    print("Error:", e)

An error occurred (403) when calling the HeadObject operation: Forbidden