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It is most likely a setting on your phone. Do you have show on lock screen (rather than hide) enabled on your phone?
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@etzagkar Welcome to the Fitbit Community! Thanks for taking the time to share the experience you are having with your Fitbit Ionic not receiving notifications.
In this case, I'd recommend checking if the notifications setting is enabled on your watch. To do this please press and hold the left button of your watch. It should vibrate and a menu will appear. Swipe left or right until you find the "Notifications" settings. Turn it "On".
If you keep experiencing the same after doing this, please try these notifications troubleshooting steps to sort this out. This should certainly help you out with this.
@NellyG Thanks for all of your help on this thread!
Keep me posted! 
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