Hi @EmmaBee88
Open the Fitbit app on your phone - in the top left corner you should see a grey oval with your devices battery status, tap on that - tap on your device - then tap on notifications. You should be able to manage your notifications in here.
The following help article may be of some help.
https://support.google.com/fitbit/answer/14225533?hl=en#zippy=%2Chow-do-i-set-up-notifications
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