Why are my forwarded domain emails not reaching my Gmail account?

Hey all! I purchased a domain from Shopify and am currently forwarding emails to my Gmail account. I am trying to verify my email in Instagram. IG is sending me an email to my domain email but its not being forwarded over and I have no way of seeing if it’s getting stuck behind a spam filter. I send myself email from various email accounts and they do come in. Anyway to fix this without using a third-party app?

Ty!!

You cannot verify your email this way. You will need to use 3rd party service to create your own email box for your domain email to verify it in Instagram.