Hi there @Moyti, welcome aboard to our Community. I would like to know if you are getting an specific error or more details of this issue?
Based on the title of your post, I can suggest a couple of ideas, but I would like to start from the basic. In order for your information syncs with a third party app is require to have your tracker paired to your Fitbit account. You can refer to these videos if you need more information to set up your tracker either on the mobile app or the computer:
How To Set Up A Tracker On A Mobile Device
How To Set Up A Tracker On A Computer
As additional note, in case you have an account already but your tracker is not paired you need to use the existing account you have to pair your tracker. Here is a post if you want to learn more about this.
Once your tracker is connected you can enjoy of many different features, including the integration of third party apps. If you tried already connected your Weight Watcher account to Fitbit it wont be require to do this again. Activities tracked by Fitbit will be converted to activity "PointsPlus" and credited to the customer's Weight Watcher's account.
In case you have not integrate your account yet my friend @SilviaFitbit has the answer for this, so please take a moment to review her post to Integrate your Weight Watchers account with Fitbit.
Hope this helps and keep me posted how it goes.
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