This site is a Microsoft-run tool for testing network connectivity to Microsoft 365. It's not a third-party service or a generic domain — it's hosted on Azure's own infrastructure and uses a certificate issued by Microsoft itself. That alone places it in a different category from the average website you'd run a scam check on.
Most legitimate network testing tools from major companies like Microsoft will have the security headers and legal pages this one does. The site has a privacy policy, terms of service, and a business disclosure page (Impressum), which is exactly what you'd expect from a tool that shares test results with your administrator. The only minor gaps are that contact info isn't immediately visible without JavaScript, and the site is too new to appear in the Wayback Machine — but those are normal for a modern single-page app that's part of a larger ecosystem.
If you're asking whether this site is safe to use for a connectivity test, the answer is yes. It's not a phishing page or a fake login portal. It's a legitimate diagnostic tool. There's no history of blacklisting, and Google Web Risk confirms no threats. For a tool like this, the identity is clear and the security is solid, so you can proceed without worry.