Hm Land Registry Application Message Failed

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "version": "1.0.0",
    "type": "object",
    "additionalProperties": false,
    "description": "JSON Schema for when a message has failed to be added to an application.",
    "required": [
        "data"
    ],
    "properties": {
        "data": {
            "type": "object",
            "additionalProperties": false,
            "required": [
                "failure_reason"
            ],
            "properties": {
                "failure_reason": {
                    "type": "string",
                    "description": "Reason why the message attachment failed"
                }
            }
        }
    }
}