Who knows, asked the source at the McDonald's in question.
Maybe they are busy doing something else that another person ordered? Or they make it after 6 A.M. I really don't know.
Parfaits are prepared early in the morning (around 6 am) and are used the rest of the day until the next day when they are prepared again. Sometimes (I think this is what happened in your case) they don't have the staff or time to prepare them so they aren't ready at 6. Because they take a long time to prepare and because they prepare them in bulk it would be detrimental to make one specifically for your order.
6am coffe parfait is not ready yet they
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