Subscription-manager throws the error 'Repositories disabled by configuration' when attempting to enable a repository

Issue

• Not able to enable the repository using subscription-manager commands.
• subscription-manager shows Repositories disabled by configuration
• Unable to manage the repositories using subscription-manager commands.
• The /etc/yum.repos.d/redhat.repo file is not updated after refreshing yum.

• Unable to install any package as yum is failing with below error:

  Updating Subscription Management repositories.
  Error: There are no enabled repositories in "/etc/yum.repos.d", "/etc/yum/repos.d", "/etc/distro.repos.d".