I sell only to restaurants, hotels or offices. Is that B2B packaging?

Usually not. § 3(7) VerpackDG counts as comparable to private households: hospitality (restaurants, canteens, snack bars, cafés, hotels), administrations, barracks, hospitals, schools, charities, professional offices, cinemas, operas, museums, leisure parks and stadiums. Farms and craft businesses count too when household-size bins, at most one 1,100-litre bin per collection group, take their packaging waste. Packaging that ends up there is licensed with a dual system like household packaging. VerpackDG § 3