注册用户的功能
是没有绑定域名吗
或者是不能在主线程？

viewModelScope.launch {
val user = LCUser()
user.username = username
user.password = password
user.email = username
// user.mobilePhoneNumber = "+8618200008888"
user.put("gender", "secret")
user.signUpInBackground().subscribe(object : Observer {
override fun onSubscribe(d: Disposable) {
}

            override fun onNext(t: LCUser) {
                _loginResult.value =
                    LoginResult(success = LoggedInUserView(displayName = username))
            }

            override fun onError(e: Throwable) {
                _loginResult.value = LoginResult(error = R.string.login_failed)
            }

            override fun onComplete() {
            }
        })
    }

环境，绑定了API 访问域名，在android application中也 LeanCloud.initializeSecurely 或 LeanCloud.initialize 中设置了这个域名。
调用注册用户 user.signUpInBackground().subscribe
onError回调，代码999 ，错误 cn.leancloud.LCException

用rest api，自己写网络封装了。还是感谢答复