My Versa had some problems in which it would not power on even after extensive charging. Finally, last night, it suddenly turned on. During the several months my Versa wasn't working, I replaced my cell phone and the new phone doesn't see the FitBit when I try to add device. I have gone to the extreme step of factory resetting the Versa and the problem persists. I have the Versa powered on in its cradle which is plugged into my PC. My phone, a Pixel XL 3a simply can't see it. For giggles, I installed the Windows app and my computer's Bluetooth also cannot see the Versa.
