product-crud | Workshop application Practical Forms with Symfony | Functional Programming library

I am fairly new to angular and just implementing CRUD operations. I am using a express server which uses mongoose for my back-end and front-end is angular.

My express server is working fine I can do all requests and I can get the list of products to display in my angular application.

When I click on a product or try to delete a product I get the "Cannot read property of type '_id' of undefined"

My question is how can I define the specific product I clicked or deleted using their ID as that is what is needed for the delete request or where am I going wrong here? I dont really understand the undefined error either as I can get all the products and display their id, name brand ect..

I am using _id in my product model and isbn because the id created in postman uses _id which is the one I need in order to delete.

Here's my product service