On the Wonder in 2018, they had a beautiful station of Greek Yogurt with nuts, granola, etc. set up. However, on the Fantasy, they had the fixings, but not the Greek Yogurt so I went to the counter and asked for a bowl of Greek Yogurt every morning. They sometimes had a hard time tracking it down, but they always found it. And because I could see the container, I know it was Dannon.
So if you don't see your yogurt out, just go ask for it.