When you land on abtest-bd.feishu.cn, you get a 404 page. That alone tells you a lot: this isn't a site meant for visitors. It's a subdomain of feishu.cn, which is the Chinese collaboration platform Lark, owned by ByteDance. Most likely, this is a test or internal endpoint used by developers.
For a test subdomain, the security setup is decent — a valid certificate and modern encryption — though it still accepts some outdated protocols that browsers have stopped supporting. That's a minor technical issue, not a warning sign. The site is clean on blacklists and hasn't been flagged for phishing.
If you're asking whether abtest-bd.feishu.cn is a scam or fake, the answer is no. It's just an empty page that belongs to a major company. There's nothing to buy, log into, or download here. The lack of contact info and legal pages is completely normal for this kind of technical endpoint. In short, it's not a threat, but it's also not a website you'd use for anything.