If you've come across japanwest1-5.pushnp.svc.ms and wondered whether it's safe, the short answer is yes — but it's not the kind of site you'd browse. This is a backend endpoint used by Microsoft Azure Notification Hubs to deliver push notifications to devices. It's not a commercial website, so you won't find an about page, contact info, or privacy policy. That's all by design.
What matters for a service like this is security and ownership. The domain belongs to Microsoft, the certificate is valid, and the connection is encrypted with modern TLS. There are no blacklist entries or malware flags. The page returns a 404, which is expected for an endpoint that doesn't serve web content.
So there's nothing to be concerned about. If you're seeing this address in network logs or device settings, it's just Microsoft doing its job. It's not a scam, not fake, and not something that needs a review in the traditional sense.