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Welcome to the forums!
I'm confused as to your questions.
Challenges are on the Fitbit app. If you open up the app you should see challenges at the bottom. Tap that and you will see what challenges are available to you. They have nothing to do with Facebook
As for contacts they need to have a Fitbit and an Email listed with them to add to Fitbit Friends.
If this does not help please be more specific on your questions so we can help better
Wendy | CA | Moto G6 Android
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I think you are talking about connecting with friends on Fitbit, but using Facebook as the method? You will need to do the following.
Best Answer
Best AnswerI would recommend uninstalling the fitbit app from your phone and then install it again, see if that fixes it.