API в методе auth.signup_fields нету поле nickname

 "response": {
    "item": [
      {
        "title": null,
        "fields": [
          {
            "title": "E-mail",
            "name": "email",
            "rules": [
              [
                "required"
              ],
              [
                "email"
              ],
              [
                "unique",
                "cms_users",
                "email"
              ],
              [
                "max_length",
                255
              ]
            ],
            "var_type": "string",
            "items": null,
            "hint": null,
            "default": null
          },
          {
            "title": "Пароль",
            "name": "password1",
            "rules": [
              [
                "required"
              ],
              [
                "min_length",
                6
              ],
              [
                "max_length",
                255
              ]
            ],
            "var_type": "string",
            "items": null,
            "hint": null,
            "default": null
          },
          {
            "title": "Повторите пароль",
            "name": "password2",
            "rules": [
              [
                "required"
              ],
              [
                "min_length",
                6
              ],
              [
                "max_length",
                255
              ]
            ],
            "var_type": "string",
            "items": null,
            "hint": null,
            "default": null
          }
        ]
      },
      {
        "title": "Анкета",
        "fields": [
          {
            "title": "Город",
            "name": "city",
            "rules": [
              [
                "required"
              ]
            ],
            "var_type": "integer",
            "items": [],
            "hint": "Укажите город, в котором вы живете",
            "default": null
          }
        ]
      }
    ],
    "sig": "f0eb40cddaa50a3fcb67f20e19dde99f"
  }
}