@crslz
Thanks for the answer.
It works exactly fine.
However, the product title is a course from learnpress.
I’m using Learnpres-woocommerce integration.
When a customer purchases a course through wooCommerce, they will receive an woocommerce template email.
In summary, when you click on a course title in the woocommerce customer order complete email, you should go to that course page.