Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
Although Fitbit supports having multiple trackers connected to an account, there are some restrictions, the main one being:
"Note that you can't connect multiple devices that use the Fitbit Gallery to one account. For Fitbit Charge 3, Fitbit Charge 4, Fitbit Charge 5, Fitbit Ionic, Fitbit Inspire series, Fitbit Luxe, Fitbit Sense, and Fitbit Versa series, only connect one of these devices to your account at a time."
Taken from: https://help.fitbit.com/articles/en_US/Help_article/1715.htm
I'm afraid there's no way round this problem.
Best Answer