Unable to proxy reqeust to sagemaker inference endpoint

[oesni]

I have launch image with command

docker run --rm -ti \
  -v ~/.aws:/root/.aws \
  -p 8080:8080 \
  -e 'AWS_SDK_LOAD_CONFIG=true' \
  -e 'AWS_PROFILE=my-profile-name' \
  public.ecr.aws/aws-observability/aws-sigv4-proxy:1.9 -v --name sagemaker

and send request

curl --location 'http://localhost:8080/endpoints/<my-endpoint-name>/invocations' \
--header 'host: runtime.sagemaker.us-west-2.amazonaws.com' \
--header 'Content-Type: application/json' \
--data '{"my-json":"payload"}'

and got message from proxy

{
    "message": "Credential should be scoped to correct service: 'sagemaker'. "
}

How Can I proxy my request to sagemaker inference endpoint??

I've tried with options like --host runtime.sagemaker.us-west-2.amazonaws.com --sign-host sagemaker.us-west-2.amazonaws.com, but didn't work.