Google GCM is not sending notification(either sent or failure) just for 1 device id

[sync55]

I am sending five registration ids(for 5 devices) to Google GCM at the same time from my ASP.NET application. Out of 5, I receive only 4 notification(sent or failure). If I use another registration id then every thing works fine. But currently only 1 specfic registration id causing me this issue. Is Google GCM queue this registration id and not send any reply for a while?Update: I have just found that the specific registration id's subscription has been Expired. So, Google is sending different response in subscription expired case. Hopefully, it be be helpful for others.