I was ultimately unable to determine why the GUI is unable to pass the port number into
the ansible playbooks.
I used the command line installation method instead [*1], and was able to successfully
complete the hosted engine install w/ iSCSI storage domain
hosted-engine --deploy --ansible-extra-vars=he_offline_deployment=true
[*1] -
https://ovirt.org/documentation/installing_ovirt_as_a_self-hosted_engine_...