Getting error Unit with ID " xxx-xxx-xxx-xxx-xxx" could not be found while trying to convert a CentOS 7.9 system to RHEL7.9 using convert2rhel

Issue

• Getting error Unit with ID "xxx-xxx-xxx-xxx-xxx" could not be found while trying to convert a CentOS 7.9 system to RHEL 7.9 using convert2rhel:-

  System registration failed with error: com.redhat.RHSM1.Error: {"exception": "RestlibException", "message": "Unit with ID "xxx-xxx-xxx-xxx-xxx" could not be found.", "severity": "error"}
  CRITICAL - Unable to register the system through subscription-manager.
  ERROR - (ERROR) SUBSCRIBE_SYSTEM::FAILED_TO_SUBSCRIBE_SYSTEM - Failed to subscribe system.