router.hms.alt-365.com has no CNAME records.
Question and response
Question
dig router.hms.alt-365.com. NS
Answer
The response has no answer records.
Authority
alt-365.com. 1371 SOA harmony.ns.cloudflare.com. dns.cloudflare.com. 2395695332 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0