shops.myshopify.com has no CNAME records.
Question and response
Question
dig shops.myshopify.com. NS
Answer
The response has no answer records.
Authority
myshopify.com. 1800 SOA blue.foundationdns.com. dns.cloudflare.com. 2395795077 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0