Error: 'rhel-server-rhscl-7-rpms' does not match a valid repository ID.

Hi,
Just installed RHEL v7.7 on a Hyper-V VM.
I am trying to install Python v3.6, following these steps:
https://developers.redhat.com/blog/2018/08/13/install-python3-rhel/

When enabling the repo rhel-server-rhscl-7-rpms, I am getting:
[root@localhost downloads]# sudo subscription-manager repos --enable rhel-server-rhscl-7-rpms
Error: 'rhel-server-rhscl-7-rpms' does not match a valid repository ID. Use "subscription-manager repos --list" to see valid repositories.

I tried also:
[root@localhost downloads]# sudo yum clean all
Loaded plugins: product-id, search-disabled-repos, subscription-manager
Cleaning repos: rhel-7-server-rpms
Other repos take up 64 M of disk space (use --verbose for details)
[root@localhost downloads]# sudo rm -rf /var/cache/yum
[root@localhost downloads]# sudo subscription-manager remove --all
1 local certificate has been deleted.
1 subscription removed at the server.
[root@localhost downloads]# sudo subscription-manager unregister
Unregistering from: subscription.rhsm.redhat.com:443/subscription
System has been unregistered.
[root@localhost downloads]# sudo subscription-manager clean
All local data removed
[root@localhost downloads]# sudo subscription-manager register
Registering to: subscription.rhsm.redhat.com:443/subscription
Username: bogdan.neagu.ext
Password:
The system has been registered with ID: f6c4a7d9-642f-4377-a339-cc3a5c274f96
The registered system name is: localhost.localdomain
[root@localhost downloads]# sudo subscription-manager refresh
All local data refreshed
[root@localhost downloads]# sudo subscription-manager attach --auto
Installed Product Current Status:
Product Name: Red Hat Enterprise Linux Server
Status: Subscribed

[root@localhost downloads]# sudo subscription-manager repos --enable rhel-7-server-optional-rpms
Repository 'rhel-7-server-optional-rpms' is enabled for this system.
[root@localhost downloads]# sudo subscription-manager repos --enable rhel-server-rhscl-7-rpms
Error: 'rhel-server-rhscl-7-rpms' does not match a valid repository ID. Use "subscription-manager repos --list" to see valid repositories.
[root@localhost downloads]#