Multisite Subdomains Don't Load

Hi, HostGator user here.
I recently installed a WP Multisite on my primary domain. I set it up to use subdomains. Everything seems to work, I can log into the Dashboard and all.

However, new subdomain creations don’t work (site not found). Tried several times, several browsers, cleared cache/cookies, waited several hours, same issue.

I think such errors are typically related to the Wildcard setup. However, this is my current setup, which (to me) suggests it’s been added correctly:

Subdomain: *.site.com
Document root: /Public_HTML
What else could the issue be?