@One-up Welcome! Thanks for being part of our Community! Sorry to hear that your Fitbit One isn't syncing with your phone. 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.
Let me know how it goes!
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