Cannot renew RHEL 7.6 Developer account subscription

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I'm having problem renewing a RHEL Developer account subscription, which expired a few days ago.
I performed the following steps, but still subscription-manager notifies me that: "Unable to find available subscriptions for all your installed products."

[qa@brendan ~]$ sudo subscription-manager remove --all
0 subscriptions removed at the server.
[qa@brendan ~]$ sudo subscription-manager unregister
Unregistering from: subscription.rhsm.redhat.com:443/subscription
System has been unregistered.
[qa@brendan ~]$ sudo subscription-manager clean
All local data removed
[qa@brendan ~]$ sudo subscription-manager register
Registering to: subscription.rhsm.redhat.com:443/subscription
Username: brendanjsonar
Password:
The system has been registered with ID: 7fe89b83-6ec2-423c-9476-062ab20d286a
The registered system name is: brendan.local
[qa@brendan ~]$ sudo subscription-manager refresh
All local data refreshed
[qa@brendan ~]$ sudo subscription-manager attach --auto
Installed Product Current Status:
Product Name: Red Hat Enterprise Linux Server
Status:       Not Subscribed

Unable to find available subscriptions for all your installed products.
[qa@brendan ~]$ 

I also unregistered the system manually in https://access.redhat.com/management/systems, but the registration (with sudo subscription-manager register --username brendanjsonar --auto-attach) still complains "Unable to find available subscriptions for all your installed products."

Any idea how to renew my RHEL 7.6 system's registration?

BC

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