Information Gathering Web Edition - Skills Assessment

I’ve been stuck on this Lab for days. I have not been able to enumerate any subdomains. Every time I use gobuster and ffuf, it turns up with no results. I’ve added the initial target’s IP address to my /etc/hosts file as well. I have even used the pwnbox to run tools. It might be the word-list I am using, but I have also tried different ones. I’ve made sure that there is a connection to the site with curl.

gobuster vhost -u http://inlanefreight.com:53482 -w /usr/share/wordlists/SecLists/Discovery/DNS/subdomains-top1million-110000.txt --append-domain

I have also used the .htb and .com URI’s just to be safe. Any help is appreciated.