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I'd recommend: restarting your tracker, rebooting your iOS device, turning your iOS Bluetooth off for 10 seconds in your settings, turn your iOS Bluetooth back on, and then open the Fitbit App to initiate a sync.
This should help, but if for some reason this doesn't, I'd then recommend re-pairing your tracker to your account using the replacement setup process. Click here for instructions.
Welcome to the Community and keep me posted!
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