Your domain does not use Cloudflare’s nameservers:
;QUESTION avantisupply.com. IN NS;
ANSWER
avantisupply.com. 21600 IN NS ns-cloud-d3.googledomains.com.
avantisupply.com. 21600 IN NS ns-cloud-d4.googledomains.com.
avantisupply.com. 21600 IN NS ns-cloud-d2.googledomains.com.
avantisupply.com. 21600 IN NS ns-cloud-d1.googledomains.com.
In any case, the domain is already connected to Shopify and displaying a password-protected Shopify store… so I’m hoping you’ve sorted this out already.
If not, please contact Shopify for help. And if you need to make any DNS changes, go to your DNS provider Google Domains (Squarespace).
Good luck!