IDM /KdcProxy URL not working on RHEL 7.4

Solution In Progress - Updated -

Issue

When "kdc = https://idmserver.example.com/KdcProxy" is set for a specific kerberos realm in /etc/krb5.conf on an IdM client the ticket should pass all the way through to the appropriate trusted Domain Controller.
Instead, attempts from kinit on the IdM client successfully reach the /KdcProxy URL, but no ticket comes back.

Environment

Red Hat Enterprise Linux 7.4

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