Solved
The installer wants to add "Windchill" as the core service name.
It looks like you entered windchill.com as web server name. So the solution is to go with a different name for the web server, something like "your organization.your top domain" (localhost, ptc.com or trucks.us would be valid examples). I don't know what will be a valid FQDN name for your server, but you have go with a resolvable hostname in order to access the web server.
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