shops.myshopify.com has no TXT records.
Question and response
Question
dig shops.myshopify.com. TXT
Answer
The response has no answer records.
Authority
myshopify.com. 3600 SOA ns1.dnsimple.com. admin.dnsimple.com. 1477078355 86400 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0