Please make sure you have connected Fitbit with Active before following these steps - Link to How do I connect Fitbit with Active?
1. Check your internet connection
Ensure you're connected to the internet. Either disable or enable WIFI if needed.
2. Make sure your Fitbit device is synchronised to Fitbit
Open up your Fitbit app and select your Fitbit Device in the top left. Ensure that the last synced time is up to date.
3. Go to your profile and open steps
Launch the Active Wellbeing app on your mobile, navigate to your profile and tap on the "steps" button under the "Connected health apps" section.
4. Resync your steps
Once in your steps page select the "Resync steps" button under the "Settings" section
5. Wait for your data to synchronise
After selecting resync your should see an indicator at the top of the screen that says "Syncing". Simply wait for your synchronisation to complete.