We sailed Azura from Tenerife in November
Booking MDR on the app was a bit hit and miss, seemed to lose coverage in certain areas of the ship. We tended just to go down between 8-8.30 to ask for a table for 2. Most nights we were given a buzzer but never had to wait more than 15 mins to be called. We were seated in the same area most nights but not exactly the same table
We’ve also sailed Celebrity and their freedom dining tends to work in a similar way which suits us as we are never in a rush or feel we have to eat at the same table or time every night