when calling the API function on postman or C# I get an error 
 {
        "error": "INVALID_CUSTOM_FIELD",
        "cause": "Custom fields which are not defined for the group cannot be used. Available custom fields are provided in the group's case template."
    }
{
    "groupId": "{{group-id}}",
    "entityType": "ORGANISATION",
    "providerTypes": [
        "WATCHLIST"
    ],
    "name": "Apple",
    "customFields": [
        {
            "typeId": "{{custom-field-1}}",
            "value": "custom field 1 sample value"
        },
        {
            "typeId": "{{custom-field-2}}",
            "value": "custom field 2 sample value"
        },
        {
            "typeId": "{{custom-field-3}}",
            "value": "mandatory custom field sample value"
        }
    ],
    "secondaryFields": [
        {
            "typeId": "SFCT_6",
            "value": "USA"
        }
    ]
}