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Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
How are you t rying to setup the Fitbit, are you using the Fitbit app on a phone?
if so, is it an iphone, android phone, windows phone, etc?
Also, whats the full name brand and model of the Fitbit you have?