Unfortunately not. We do not receive weight data from Fitbit. If you manually track your weight within the myFitnessPal app, and you have your myFitnessPal account connected with Go365, then you can be awarded for the Weekly Log activity within the mobile app.
Device tracked data is not sufficient proof for Recommended Activities. To satisfy that type of activity, your weight needs to be measured by a health professional, and the proof should be uploaded to your Go365 account via the Activities page.