If you've come across eastus1-4.pushnp.svc.ms, you're likely looking at a backend service endpoint, not a website you can visit. This domain is part of Microsoft's push notification infrastructure, used by apps and devices to send real-time updates. It returns a 404 error when accessed via a browser because it's not designed to serve web pages. That's normal for this kind of service.
Because it's Microsoft-owned and hosted on their own network, the security credentials are solid — valid TLS, enforced HTTPS, and no blacklist history. There's no privacy policy or contact page, but that's expected for a technical endpoint. The question 'is eastus1-4.pushnp.svc.ms a scam?' doesn't really apply here. It's not a storefront or a service you interact with directly. It's a piece of Microsoft's cloud infrastructure. If you're troubleshooting an app that connects to it, rest assured it's a legitimate part of the Microsoft ecosystem. There's no reason to distrust it for its intended purpose.