When you land on t.vivenu.com, you get a blank page that says 'Cannot GET /' — that's a 404 error, not a working website. So the first question isn't whether it's safe to buy or sign up, but whether this site is actually meant to be used at all. The domain is a subdomain of Vivenu, a company known for event ticketing software, but this particular endpoint offers zero function.
For a legitimate business subdomain — especially one that might later handle ticket sales or personal data — you'd expect clear ownership details, working contact information, and at least a basic privacy policy. This site has none of those. The technical setup is fine (good security, fast CDN), but that only makes the missing content and invisible identity more suspicious.
Is t.vivenu.com fake? Not in the sense of an active scam — there's nothing to interact with. But the lack of transparency means there's no reason to trust it. If Vivenu intends this subdomain to be used, they need to put up a real page and explain who runs it. Until then, treat t.vivenu.com as an unresolved question mark and don't enter any personal data here.