Error 31 with yum update

If I remember correctly I did the migration, however, I have the error 31
...
Error Class Code: 31
Error Class Info:
This system does not have a valid entitlement for Red Hat Network.
Please visit https://rhn.redhat.com/rhn/systems/SystemEntitlements.do
or login at https://rhn.redhat.com, and from the "Your RHN" tab,
select "Subscription Management" to enable RHN service for this system.
...
when I do subscription-manager list

+-------------------------------------------+
Installed Product Status
+-------------------------------------------+
Product Name: Red Hat Enterprise Linux Server
Product ID: 69
Version: 6.9
Arch: x86_64
Status: Subscribed
Status Details:
Starts: 10/31/2017
Ends: 10/30/2018

what I did wrong?