the issue sometimes happens with some emails, you can try adding another email (preferably Gmail) on the admin notification here:
If you still have not received the sample email, you can reach out to us at email@example.com and we'll look further into the issue.
I'm new to shopify and wanted to send myself the template and see how it looks. However, I have pressed the button more than ten times and no email received. does anyone know what was going on there? thanks