02-08-2016 19:56
02-08-2016 19:56
02-09-2016 12:21
02-09-2016 12:21
@Rbartolet Welcome to the Fitbit Community! I will recommend to try all of these syncing troubleshooting steps to connect the tracker to your iPhone 6. Also, log out from the account, reboot your phone, and log back in.
Try that out and let me know how it goes!