I have a rather particular problem.
When on a BUNDLE product, I use the "Dynamic SKU" item and try to order the product.
I get an e-mail with the following text.
Error filtering template: The product that was requested doesn't exist. Verify the product and try again
If I remove the dynamic sku, I receive the order confirmation email with the correct template.
I tried to change the template (email) too, but the problem persists
It seems some white space problem in the SKU. Remove white spaces and capital letters while entering the SKU.
Simply enter the SKU and check again.
Hope this will help you to solve the issue.
Let me if it isn't resolved.
If worked? Click KUDOS and accept it as a solution.