Hi there @Mazswindon, this is your first post, so let me give you a warm welcome to the Fitbit Community!
The Samsung Galaxy J3 is not listed as compatible, so many features may not work as is expected. By not being compatible doesn't meant it won't work, is just this type of behavior is common since the app is not optimized to work with the device in question.
Now, the following instructions may offer you some additional help to get you back on track: Having trouble syncing? (here's how to fix this).
Hope this helps. See you until the next opportunity!
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