@poplacto Welcome! It's great to see you around!
Let me help you syncing your Charge 2 with your phone. Your phone doesn't show as compatible but that doesn’t mean it won’t work it just means that it hasn’t been tested by our team. You can try going to your phone's bluetooth settings and remove all devices listed there. Restart your phone and restart your device. After this try syncing them. Also, if you are using an Android device, check that your app has the necessary permissions (settings > apps > Fitbit > permissions) and make sure bluetooth and location services (GPS) are on. You can find additional suggestions here.
Let me know how it goes.
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