bumble.alvaria.io has no CNAME records.
Question and response
Question
dig bumble.alvaria.io. NS
Answer
The response has no answer records.
Authority
alvaria.io. 1800 SOA graham.ns.cloudflare.com. dns.cloudflare.com. 2397742375 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0