Not that it helps you directly, but I'm also on an S7 and haven't had any issues following the update.
Have you tried doing all the fun troubleshooting like restarting bluetooth, rebooting your phone, and maybe even rebooting your tracker?
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Best AnswerRestarted my phone and uninstalled and reinstalled the app, but didn't help. But I found how to reatart my fitbit and it worked! Plug in your fitbit to charge, hold butting on the side of the fitbit for 10-15 seconds. You will see the fitbit icon pop up(mine went black for a few seconds tho). Unplug it, and at that point mine synced.
Best AnswerFound a fix under a different post. Go to Google Play services and turn on permissions for phone and storage (Settings -> Apps -> Application Manager -> Google Play services -> App Settings -> Permissions, then allow/turn on Phone and Storage. Was then able to log in and sync okay.
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