From your mobile device, head to Settings > Bluetooth, then toggle Bluetooth off, then on. Try turning Bluetooth off and on again.Alternatively, you can press and hold the Fitbit app icon on your home screen and release it when you feel a vibration.From your mobile device, head to Settings > Apps & notifications > See all apps > Fitbit > Force Stop. You may need to force quit the Fitbit app.Once you’re there, turn on the Location toggle at the top of your screen. To do so, head to your phone’s Settings menu and select L ocation. In addition, you need to switch on your phone’s location services to scan for Bluetooth devices.To do so, head to your phone’s Settings menu, select Apps & notifications, select Permission manager, choose Location, select Fitbit, then make sure the Allow all the time option is selected.

If your smartphone is running Android 6.0 Marshmallow or later (it probably is), you may need to manually grant the Fitbit app permission to scan for Bluetooth devices.You can then pair your Fitbit device with your Fitbit account. Open the Fitbit app, select your account photo, select your tracker, then tap the trash icon in the top-right corner. Try removing and re-adding your Fitbit device from your Fitbit account.You’ll also need to make sure your phone has Bluetooth turned on ( Settings > Bluetooth > On) and that you’re only trying to connect your Fitbit to one Bluetooth-enabled phone or tablet. Make sure you install the Fitbit app on your phone.

Fitbit strap