No repositories available on a registered RHEL system with a subscription attached

Issue

• After registering a RHEL 8.3 system and attaching the 60 Day Evaluation of Red Hat Ansible Automation Platform, Self-Support (100 Managed Nodes) subscription, no repositories are available on a registered RHEL 8.x system with a subscription attached:

  # subscription-manager repos --enable ansible-2.9-for-rhel-8-x86_64-rpms
  This system has no repositories available through subscriptions.
  

  # yum -C repolist
  Loaded plugins: builddep, changelog, config-manager, copr, debug, debuginfo-install, download, generate_completion_cache, needs-restarting, playground, product-id, repoclosure, repodiff, repograph, repomanage, reposync, subscription-manager, susemanager, uploadprofile
  Updating Subscription Management repositories.
  YUM version: 4.2.23
  cachedir: /var/cache/dnf
  No repositories available
  

• After successfully registering and subscribing RHEL 7.9 server with subscription manager, unable to see any repositories with yum repolist command

  # yum repolist all
  Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager, susemanagerplugin
  repolist: 0