Getting WaitingForActivation while using c# sdk

Hi,

I am using c# sdk for my server application.i have already done authorization using appKey and appSecret and user name password.

now when i am going call method to get the messages (Message List) from c# using below code.its giving me following response.

Request :

var extension = rc.Restapi().Account().Extension();

var response = await extension.MessageStore().List();

var messages = response.records;

in response i am getting below :

Id = 1487

Status = WaitingForActivation

Result = null

can you please help me solve this problem