Find Duplicates After Filtering

I have a list of first column is Employee Id Numbers, Second column is Dates of checks issued. I want to find if there are any duplicate dates for a single employee ID number. I thought if I filtered the ID number and put a conditional value for Duplicates on dates I would be able to quickly see if any of the dates were the same. However since the conditional value is reading all the dates outside the filter everything is Highlighted. Is there anyway to get the conditional value to apply only to dates shown?

Thanks but I have no interest in removing duplicates. I just need to see if any employee was paid twice on the same day. There are about 60 employees with 24-26 checks each so it would be much easier to just find the duplicates (if there are any)in each Employee Number.