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Hello @Jies, thanks for joining the Fitbit Community, it's great to have you on board. 
I appreciate you have brought this to my attention. Tell me, which tracker are you currently using? Have you restarted it yet? Have you restarted your phone as well? If so, I would like to suggest you the following:
- Go to the Bluetooth settings on your phone and tap on tracker. Then tap on Forget this Device.
- Force-close the Fitbit app by double tapping the home button on your phone and swiping up the app.
- Open the app again and tap on Account > Your Tracker > Notifications. You will receive the following Pop-up:
- Then, once you tap on Set Up, the app will begin setting up your tracker with the Bluetooth on your phone, which will prompt the next pop-up:
- Tap Pair
- Once you get back to the tracker options, tap on Notifications an enable the ones you'd like to receive.
Additionally, please go to your phone Settings > Notifications > Fitbit and Settings > Notifications > Messages and check that the following is enabled:
- Allow Notifications
- Show on Lock Screen
- Show in History
I hope this can be helpful, give it a try and keep me posted in case you need anything else.
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