The domain you are trying to reach is vulnerable to takeover by malicious parties. In researching an issue with Amazon Web Services (AWS) CloudFront configurations, this vulnerability has been identified. In order to prevent attackers from taking over DNS records related to your domain, this subdomain is being squatted.
Work is underway with AWS and US-CERT to ensure these configuration issues are fixed and domains are returned to their proper owners. However, leaving them orphaned makes them vulnerable to takeover by malicious actors for use in attacks on third parties.
Please check back for updates related to fixing this issue and having the DNS records released to the site owners. This is a large effort so please be patient while this is being coordinated. This DNS record will remain protected from hijacking until it can be released.
You can read more about this effort here: CloudFront Hijacking