@Flemingj Welcome to our Community! Currently your phone isn't listed as a compatible device so I can't guarantee that it will work with your Flex 2. Still you can try doing basic troubleshoots. Remember to have the location services on and allow the Fitbit apps access to it as this is now required by Google on Android 6 to sync bluetooth devices. After this restart the bluetooth on your phone and restart your tracker by doing the following:
1.- Plug the charging cable into the USB port on your computer or a UL-certified USB wall charger.
2.- Remove the pebble from the wristband and press it into the compartment on the charging cable. The pins on the charging cable must align with the corresponding pins on the back of the pebble to lock securely in place.
You’ll know the connection is secure when the pebble vibrates and you see the indicator lights blinking.
3.- Find the button on the charging cable below the tracker compartment.
4.- Press it three times within five seconds. The tracker vibrates each time you press the button. A few seconds after the third press, all the lights will flash simultaneously. This means the pebble has restarted. If you miss the light flash but notice the pebble has resumed charging, that too is confirmation that the restart was successful.
5.- Remove the pebble from the charging cable and insert it back into the wristband.
The pin was used for the first Flex so you can disregard those instructions.
If this doesn't work you can sync your tracker using a Windows or Mac computer with the Fitbit Connect software (or app in the case of Windows 10) and native bluetooth on that computer or use a compatible mobile device if you have one.
Let me know how it goes!
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