As I see currently the only Two factor authentication is Phone Number/SMS however there needs to be more options, you would be able to use your security key and I recommend adding Authenticater app too
This would decrease the chance of people's fitbit account hacked, our fitbit accounts has a lot information about us (such as resting heart rate, steps, distance, sleep and more), Phone number/SMS is less secure because people can get SIM Swapped, Rating of how secure two factors
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