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Welcome to the forums!
Try these threads and see if they help
https://community.fitbit.com/t5/Charge-HR/Having-trouble-syncing-here-s-how-to-fix-this/td-p/1301370
See this thread as well for syncing
https://community.fitbit.com/t5/Flex/syncing-issue-with-my-Flex/m-p/1701255#M163030
Syncing issue for Windows 10
https://community.fitbit.com/t5/Charge-HR/Having-trouble-syncing-here-s-how-to-fix-this/m-p/1301405#...
Check out the discussions boards! A lot going on and I'm sure you have some contributions as well!
Hope to see you around!
Wendy | CA | Moto G6 Android
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Great help @WendyB! Welcome to the Forums @Dortoinia! To better assist you, can you please confirm that you have followed @WendyB's awesome suggestions?
Also, keep in mind that a syncing difficulty is usually caused by a missing requirement. To read more about this take a look at the help article Why won't my Fitbit device sync?
Keep me posted! 🙂