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Ivanti have a defect open reference 6717 which is about identity server using local fqdn rather than the external fqdn. Essentially the ability to set the response address is missing from the config options for identity server, arguably this could be used to set the alias however unsure.
This should be being fixed in a future version but please do report it to your vendor referencing the defect above as that will help to add weight on getting a fix provided.
Thanks for the information! I appreciate it.