Or you could have said something like, "Do you always work at this counter?"
Employees move around. Some are employed by the store, some are employed by a particular brand. For instance, in Best Buy, Samsung employs the people in the Samsung Experience area of the store, and they often have sales reps from LG, Comcast, Sony, etc. in other parts of the store. Vendors even visit places like Walmart and set up tables there.
Generally, but not always, the questions we are told to ask probes something that the MSC or client is trying to figure out. In your case, it must be that sometimes the employee works elsewhere, for a brand-name cosmetic company, or ???
Rejections happen. I have done thousands of shops, and once in awhile it still happens to me because some odd thing happens which is covered in one sentence in a 20 page instruction manual, and because I have done dozens of the same shop, and it never happened, I got complacent and did not spend 20 minutes poring over the manual again. My fault. Or I get so used to shipping boxes to food banks, that when I bought a box at Walmart instead of Staples, the box weighed more, and I didn't weight it. That was a $35 mistake, and one totally under my control. Of course, it was a business expense, and you can still deduct the mileage for going to that cosmetic counter even though you didn't get paid.
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008