A factory reset should have been done or at least the pin code disabled before removing the tracker. This could also have been done through the trackers settings at anytime.
Here is the process
Fitbit OS hardware reset.
On the watch, hold all three buttons for about twelve seconds. This will trigger the 2-button hardware restart after about eight seconds.
- When the Fitbit logo appears, then disappears, release the bottom right button, whilst continuing to hold the left and top right buttons until you feel a strong vibration. This indicates the factory reset was initiated.
- This process may take several seconds, and eventually, the Fitbit logo appears and the device boots and displays go to Fitbit.com/setup.
- If you fail to release the bottom right button in time or otherwise don't follow the procedure precisely, the Fitbit logo reappears quickly and boots without factory reset.
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