You selected a car in the App and they have not gotten back with you? Is the car you want still showing as available? I had to wait two days to get the car I selected because they were a new dealer and had to get trained, but they did keep me updated via emails and phone calls because they wanted to give me a time and day to pick up the vehicle and not come too early. That was my 2nd FAIR car. My first one was ready the next day since they were more experienced with the process.
I would follow up with the concierge at the main telephone number or email. I keep saving cars to my favorites (click on heart) in the app because I like to save vehicles I think are good deals (usually hybrids or luxury vehicles) or newer than the Subaru I am currently driving, but they become unavailable VERY quickly, I am not sure if it is because the dealer is selling it themselves or if someone is used the FAIR app to “rent” it, but now that Android is available it might become more competitive. I think it is a great way to try out a car without commitment. I am very happy, but I still look for lease deals or a good purchase price.