Considering the fact that embedded forms and the Shopify integration can have a variety of variables that might cause issues, I will just recommend some places to check. You can let us know here on the Community where the issue was or if it was none of them as well. If you have not already, I feel like connecting with our support team would be a good idea as they can go into your individual account and have a deeper dive into what might be causing the problem.
Hopefully those can get you in some direction. I would also recommend checking to see if your integration is not broken and that all syntax is correct when working with your Shopify site.
Considering the fact that embedded forms and the Shopify integration can have a variety of variables that might cause issues, I will just recommend some places to check. You can let us know here on the Community where the issue was or if it was none of them as well. If you have not already, I feel like connecting with our support team would be a good idea as they can go into your individual account and have a deeper dive into what might be causing the problem.
Hopefully those can get you in some direction. I would also recommend checking to see if your integration is not broken and that all syntax is correct when working with your Shopify site.