GET S3 Presigned URL SignatureDoesNotMatch

Hi, I am trying to make some side projects to generate url for an object using lambda.

This is my python code in my lambda :

BUCKET_NAME = os.environ['BUCKET_NAME'] 
s3_client = boto3.client('s3', region_name='eu-central-1')

def lambda_handler(event, context):
    object_key = json.loads(event['body'])['key']
    print(generate_presigned_url(BUCKET_NAME, object_key, 3600))

def generate_presigned_url(bucket_name, object_name, expiration=3600):
    """
    Generate a presigned URL to share an S3 object.

    :param bucket_name: string, name of the bucket.
    :param object_name: string, name of the object.
    :param expiration: Time in seconds for the presigned URL to remain valid, default is 1 hour.
    :return: Presigned URL as string, None if error.
    """
    # Create an S3 client
    
    try:
        response = s3_client.generate_presigned_url('get_object',
                                                    Params={'Bucket': bucket_name,
                                                            'Key': object_name},
                                                    ExpiresIn=expiration)
    except ClientError as e:
        print(f"Error generating presigned URL: {e}")
        return None

    return response

And the signature gives error: Firstly it generates a url that redirects me and adds the region : https://bucket.s3.amazonaws.com/object_key to https://bucket.eu-central-1.s3.amazonaws.com/object_key. And responds with : <Code>SignatureDoesNotMatch</Code> <Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>

I did this using my aws iam user , with boto3 sdk and aws cli. With aws cli works, with boto3 s3 client does not work!

2 days ago did not work , today it worked . I redeployed the same infrastructure with aws cdk. And it does not work!!!