Has it worked for you? It has been, that you go to GS once OB and order them for your room.
Now, I do see it listed onboard services on the cruise personalizer, but it doesn’t work for me. Maybe just another programming error, or their system is not working? IDK
The OP could also call in and order or do through the TA/CVP to order them.
If in a full suite, you probably will have flowers in the suite. Or, at least we did, but that was a while ago. Then, if not, you could contact GS, or your concierge, if your ship has one to place an order.