TOPIC: Conditional fields not displaying in detailed group registration

I have a detailed group registration where I want to collect information from each member. I have conditional fields that I want to display: for instance, if the registrant is from the United States, I want to display a dropdown menu of the 50 states and a zip code field; if the registrant is from Canada, instead I want to display a dropdown menu of the 10 provinces and 3 territories and a postal code field. This works fine if I define my event as an individual registration. However, if I define my event as a detailed group registration event, the conditional fields are not displayed. What am I missing?