If the code is not working, it is because it cant be applied to the item in your cart. Here is the response I got from a representative via chat
"Okay. Let me inform that you can use the code to buy earbuds, mobile products and for partial payment for the purchase of the mobile phone on Samsung.com website."
I'm still a little unsure what is considered a "mobile product" since the watches are not on the list of items the codes can be applied to.
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