Registering a system to Red Hat Lightspeed (Insights) fails with error 401 Unauthorized

Issue

• insights-client command fails with below error:-

  # insights-client --test-connection
  Running Connection Tests...
  === Begin Upload URL Connection Test ===
  Testing: https://cert-api.access.redhat.com/r/insights/uploads/
  POST https://cert-api.access.redhat.com/r/insights/uploads/
  HTTP Status: 401 Unauthorized
  HTTP Response Text: Insights services authentication failed
  
  Connection failed
  === End Upload URL Connection Test: FAILURE ===
  
  === Begin API URL Connection Test ===
  Testing: https://cert-api.access.redhat.com/r/insights/
  GET https://cert-api.access.redhat.com/r/insights/
  HTTP Status: 401 Unauthorized
  HTTP Response Text: Insights services authentication failed
  
  Connection failed
  === End API URL Connection Test: FAILURE ===
  
  Connectivity tests completed with some errors
  See /var/log/insights-client/insights-client.log for more details.