Your Fitbit account has been successfully connected to Healthi if you look under Settings > Sharing > Fitbit Step Tracking in the Healthi app and see the Disconnect button as shown here:
Once connected, each day you'll see an item listed under Activity in your Tracker called Fitbit Steps as shown here:
If you're not seeing a Fitbit Steps entry that is because the Fitbit API is returning 0 steps for your account. There are a number of reasons this might happen and that is what you need to figure & resolve. Below is a summary of the two potential causes and how to fix them.
Reason 1: Your Fitbit device isn't syncing with the Fitbit app
To verify your Fitbit device is syncing with the Fitbit app correctly, simply open the Fitbit app and confirm you see your current steps. If you don't see your current steps then your device isn't syncing correctly with the app. To fix this, follow these instructions from Fitbit: Why won't my Fitbit device sync?
Reason 2: Your Fitbit app isn't syncing with Fitbit.com
If you DO see your steps in the Fitbit app then the issue is that the Fitbit app isn't syncing correctly with the Fitbit website. Your step data has to be synced to the Fitbit website before it will be available in Healthi. To verify this issue, login to the following page on Fitbit.com and select Week & Steps which should show your daily steps for the past week: https://www.fitbit.com/activities
If nothing is showing there and you're seeing your steps in the Fitbit app, then there is an issue syncing with the Fitbit mobile app syncing to the Fitbit website which you need to resolve. If you're NOT seeing your steps in the Fitbit mobile app then it's an issue syncing from your Fitbit device to the mobile app (see Reason 1 above). To sync the Fitbit app with the Fitbit Website, follow these instructions from Fitbit.com: Why won't my Fitbit device sync?
Once your Fitbit device is syncing correctly to the Fitbit website, Healthi will pull your steps every 15-20 minutes throughout the day which you can see directly in your Tracker in the app (see screenshot above).
If you've done everything suggested above and it's still not working please Contact Support so we can help.