When updating a contact, invalid JSON syntax or invalid field that cannot be updated by this endpoint

Invalid JSON or fields other than first_name, middle_name, last_name, legal_name, preferred_name, unique_customer_provided_id or custom_fields exist in update contact request

User provided an invalid JSON or trying to update fields other than first_name, middle_name, last_name, legal_name, preferred_name, unique_customer_provided_id or custom_fields of a contact

Fix JSON input or change update contact request to update only first_name, middle_name, last_name, legal_name, preferred_name, unique_customer_provided_id or custom_fields