When you land on osupporto-help.zendesk.com, you don't actually stay there. The site immediately sends you to 24hours.support-nebula.com, a completely different domain. That alone is a red flag for anyone wondering 'is osupporto-help.zendesk.com a scam?' because legitimate customer support portals usually keep you on their own branded domain.
The site itself is a Zendesk subdomain, so the technical backbone is sound. Security checks like SSL and HSTS pass, and there are no malware warnings. But the bigger question is who runs this help desk. There's no favicon, no contact page, and the domain has no history in the Wayback Machine. For a business that expects to field customer requests, that's a troubling lack of transparency.
If you're looking for osupporto-help.zendesk.com reviews, you won't find many because the site is essentially a redirect. The real business behind the support center is hidden behind the target domain, which itself is not well established. Until you can verify the company name, physical address, and privacy practices, it's safer to treat this as a high-risk interaction. Stick with known support channels for now.