I just got myself the Galaxy Fit2 and downloaded the Galaxy Fit app today (01/11/2020), but noticed there are no options for the Fit2 during setup. The only devices I can choose are Galaxy Fit E, Gear Fit2 Pro, and Gear Fit2. I've tested those, just to be sure, and the app was unable to find anything. I checked the logs for the app itself and it was apparently updated a month ago to support the Galaxy Fit2 yet there's nothing there.

The phone itself (iPhone running iOS 12) finds it perfectly fine under Settings > Bluetooth, but connecting it there gets me nowhere and the app is still unable to find the Fit2 if I try it that way around; all it does is that the Fit2 shows this infinite loading/circle icon but nothing else happens.

Never had any problems paring devices and using Bluetooth, so I'm a bit surprised that the act of merely connecting and setting things up via the app isn't working.