I've sometimes seen with these promos that the bonus miles don't appear in the booking, though recently they've more consistently appeared, I'd not worry right now if they don't appear. They usually post immediately, if they were showing prior, but I've also had success in getting EK to credit bonus miles to changed flights by sending them a message on Twitter, took a week but they credited me the miles in the end (and more than the original bonus miles on my booking as I changed my flight to a city in a different region)