I’m using JSON Schema to validate a json object like below:

{
     "json": 
           { "is_expanded_identification": false, "identity":
                                                  { "concat_id": 44446543R, "concat_id_type_code": 1 } 
           }
        ,
     "study_year": "2025"      
}

Here is my Json Schema:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "required": [
    "json",
    "study_year"
  ],
  "properties": {
    "json": {
      "type": "object",
      "required": [
        "is_expanded_identification",
        "identity"
      ],
      "properties": {
        "is_expanded_identification": {
          "type": "boolean"
        },
        "identity": {
          "type": "object",
          "required": [
            "concat_id",
            "concat_id_type_code"
          ],
          "properties": {
            "concat_id": {
              "type": "integer",
                 "errorMessage": {
                      "type": "My custom messsage"
                                 }
            },
            "concat_id_type_code": {
              "type": "integer"
            }
          }
        }
      }
    },
    "study_year": {
      "type": "string",
      "pattern": "^\d{4}$"
    }
  }
}

I would expect it to show my custom message because of the “contact_id” field R letter,
Instead it show the JSchema default message “Unexpected character encountered while parsing number: R.”.

I’v tried “errorMessage”/’message” but none of them worked for me.
Isn’t it support with Json SChema Validations of newtosoft?