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Hi, @aamartino - make sure you properly unpaired your watch from the old phone, as it can only be paired with one phone.
In the old phone remove the Bluetooth entry.
On the new phone logout of the Fitbit App and login again and without closing the App go to the phone home screen.
You should see a pop up sync, click on this and follow the pair and link prompts.
On the watch also check you don't have Sleep or Do not disturb enabled.
Author | ch, passion for improvement.
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