Unable to attach subscription after reinstallation

Hi,

I have reinstalled redhat 7 desktop and am unable to attach subscription. I was able to attach subscription the first time I had installed.
What do I need to do?
Subscription list in my account shows startdate and enddate as 2016-11-19 2017-11-18 for Red Hat Enterprise Linux Desktop, Self-support

subscription-manager attach --auto
shows

Installed Product Current Status:
Product Name: Red Hat Enterprise Linux Desktop
Status: Not Subscribed

Unable to find available subscriptions for all your installed products.