When you land on prophoenix.co.hubbard.mn.us, you're greeted by a bare IIS Windows Server page and little else. There's no about section, no contact details, and no indication of what the site is for. For a personal subdomain or a test site, that's not alarming, but it means you have almost nothing to judge legitimacy by.
Most legitimate websites — even personal ones — give you some clue about their purpose or who runs them. Here, there's no social media links, no privacy policy, and no history in the Wayback Machine. The site is technically clean: it hasn't been blacklisted or flagged by Google, and its SSL certificate is valid. But without any content or identity, you're essentially trusting a blank page.
If you're asking "is prophoenix.co.hubbard.mn.us a scam?" — the honest answer is that there's not enough signal to call it one. But there's also no reason to hand over your data or money. This is a site that doesn't ask anything of you, so the safest approach is to treat it as a placeholder and move on.