Error Status code 404 accessing repositories during yum update after RHEL 8 to 9 upgrade

Issue

• When attempting to perform yum update the following error occurs:

   $ yum update
   Updating Subscription Management repositories.
   Red Hat Enterprise Linux 8 for x86_64 - BaseOS (RPMs)                                                                        
   0.0  B/s |   0  B     00:01
   Errors during downloading metadata for repository 'rhel-8-for-x86_64-baseos-rpms':
     - Status code: 404 for https://cdn.redhat.com/content/dist/rhel8/9/x86_64/baseos/os/repodata/repomd.xml 
   Error: Failed to download metadata for repo 'rhel-8-for-x86_64-baseos-rpms': Cannot download repomd.xml: Cannot download                   
     repodata/repomd.xml: All mirrors were tried