In my division the person who does the highering deals with all employee discounts. The position is called the service director. The service desk only deals with customer discounts
Talk to your hiring manager (in my store they're called the "Associate Relations Manager") about it. This happened once for me too, I got Kroger milk and juice and the employee discount only worked for the juice. They just did a custom loyalty refund but in my case it was easy since I only got like 2 things. Sometimes the system has a glitch and doesn't retrieve the discount properly for every single item, but it's easy to get it refunded.
In my division the person who does the highering deals with all employee discounts. The position is called the service director. The service desk only deals with customer discounts