Hi, @Aniamiki, & @Dewesh14 welcome to the community, may I draw your attention to this article How do I get notifications from my phone on my Fitbit device? In addition to this advice check the Fitbit App on your phone has all the permissions granted and any battery-saving setting is disabled for the Fitbit app. This last is because some phones (you do not mention the make & model of your phones) treat the Fitbit app as non-essential and put it to sleep while it needs to run constantly in the background.
I hope this helps but if you are still stuck please post here again.
Cheers
Gr4ndp4 | UK
AWAKE! for morning in the bowl of light has cast the stone that set the stars to flight.
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