Thanks all for the input. It looks like the CDG -> BIQ business seats were sold out for that particular flight which is why I was stuck in the economy cabin. However, the fare I paid is the Business Flex fare, which is fully refundable if cancelled. Based on the responses I've received, it sounds like I won't have access to the lounge, which kind of sucks. I was hoping to rest a bit during my layover after an overnight flight.