Unable to Find Available Subscriptions

Hi,

Trying out latest RHEL 7.4 Server on a Hyper-v (hosted on Windows 10). For this, I have registered as a developer and I can see I have a Developer Subscription available but, after installing RHEL on the VM, I can see the VM gets registered against my account but I am unable to attach the subscription to the VM.

When I run:
subscription-manager list --available
I get:
No available subscription pools to list

I can't see anywhere (either through running rhel commands or looking in the Portal) what I may be missing...

I have tried also running the following sequence of commands as suggested in some discussions:
subscribe-manager remove --all
subscribe-manager unregister
subscribe-manager clean
subscribe-manager register
subscribe-manager refresh
subscribe-manager attach --auto
But still, no subscription gets attached to the rhel installation.

Any help on this would be much appreciated.

Thanks in advance,
DP