Fix a Fitbit showing a red X with data not cleared sync and try again - MyHealthyApple
Fitbit Versa or Sense Controls not connecting to phone? Steps to fix it - MyHealthyApple
How to Connect a Bluetooth Headset to a Fitbit Versa - Support.com TechSolutions
Amazon.com: Fitbit Versa 2 Health and Fitness Smartwatch with Heart Rate, Music, Alexa Built-In, Sleep and Swim Tracking, Black/Carbon, One Size (S and L Bands Included) : Electronics