Hi there @Sassycats, let me give you a warm welcome to the Fitbit Community! When you say you have shut down your phone and tracker, are you referring to a restart?
If your app shows an exclamation point, it means your phone is not able to locate your tracker. I have experienced this in the past and what I do as a workaround, is to turn Bluetooth Off and access to the Fitbit app. Here I tap in the red message alert that says Bluetooth is Off, this will turn On the Bluetooth again and will help to sync the tracker.
You can give it a try to the following post also for more help or if the issue persists: Having trouble syncing? (here's how to fix this).
See you later and hope this helps.
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