### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When attempting to sign some document using Localstack KMS inside a lambda container (also running on localstack), the localstack KMS listener returns some unknown error.

The KMS key and lambda containers have been created from the same CDK app deploy, and I can see all the resources in the localstack web console.

The test application I'm using to prove this behaviour is available here:
https://github.com/LukaHedt/localstack_kms_test

Instructions to run are in the main Readme, and the `/localstack/Readme.md` file.

`aws-sdk` returns an unknown error, and the localstack docker logs that I receive are available here:
https://pastebin.com/58Z3fXi3

Have done an amount of testing and can confidently claim the following:
- Have tested on multiple machines with the same outcome
- Doesn’t make a difference if I specify an ARN or a KeyID in the signing request
- Downgrading localstack versions either didn’t make a difference, or I couldn’t actually deploy a localstack container with version 0.12.20 or lower.

### Expected Behavior

KMS Sign should return a signature for the given payload.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

Test application demonstrating the current behaviour is available here:

https://github.com/LukaHedt/localstack_kms_test

Full instructions to run are in the `/localstack/Readme.md` file.


### Environment

```markdown
- OS: MacOS Monteray 12.3
- LocalStack: 0.14.0
```


### Anything else?

_No response_
if attribute in REF_ID_ATTRS:
            return self.physical_resource_id
        return self.physical_resource_id and aws_stack.kms_key_arn(self.physical_resource_id)
    
    @staticmethod
    def add_defaults(resource, stack_name: str):
        props = resource["Properties"] = resource.get("Properties", {})
        tags = props["Tags"] = props.get("Tags", [])
        existing = [t for t in tags if t["Key"] == "localstack-key-id"]
        if not existing:
            
            tags.append({"Key": "localstack-key-id", "Value": short_uid()})
    @classmethod
    def get_deploy_templates(cls):
        def _create(resource_id, resources, resource_type, func, stack_name):
            kms_client = aws_stack.connect_to_service("kms")
            resource = cls(resources[resource_id])
            props = resource.props
            params = {}
            if props.get("KeyPolicy"):
                params["Policy"] = json.dumps(props["KeyPolicy"])
            if props.get("Tags"):
                params["Tags"] = [