Thank you for your post, I'm happy to look into this with you.
I first recommend checking that the sender email for your store (which can be found in the admin under Settings > Notifications > Senderemail) doesn't include no-reply or noreply (such as email@example.com or firstname.lastname@example.org). Couriers will automatically drop any emails sent from an address with those words in it.
If you've confirmed that isn't the case with your email, I recommend contacting our live support team through the Help Center. From there we'll be able to look up your email in our systems and see if there are any issues we can clear. To get in touch you can head over to the Help Center, enter the details of your issue into the chat assistant, and click I still need help to be connected with a Support Advisor.
Please let me know if you have any other questions!
Greta | Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog