When trying to finalize the NS web site Certificate, the following errors are seen:
Failed to finalize certificate replacement for: 480fb256-875a-4462-b74a-e6f68eb4cbca
Object already exists.
Exception occured while finalizing certificate replacement operation.
Object already exists.
Failed to switch 'IIS://LocalHost/W3SVC/1/Root/Altiris' web site to new certificate.
Object already exists.
COM Exception errcode: 0x8009000F
8.x
Certificate was manually added to IIS.
As the Certificate already existed in IIS > Server Certificates, it needed to be removed. After doing so, clicking Finalize Certificate was successful.