_acme-challenge.heysender.com has no AAAA records.
Question and response
Question
dig heysender.com.80ad5b49141b73d0.dcv.cloudflare.com. AAAA
Answer
The response has no answer records.
Authority
dcv.cloudflare.com. 1800 SOA graham.ns.cloudflare.com. dns.cloudflare.com. 2398283196 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0