Google recently rolled out their “primary category” requirement to Google My Business Locations bulk accounts. Instead of associating the first category per location in a bulk account as the “primary category”, the roll out is instead selecting nothing as a primary category for all locations in a bulk account.
This means that if you want to receive the benefit of having an associated “primary category” you need to go into your bulk accounts and chose the primary category for all locations. Since Google has been placing more importance on categories in their recent Google My Business guidelines updates, these may be a non-trivial ranking factor. So those of you with large, multi-location clients now know what you are doing for the rest of the day.