Hello @Delgas, welcome aboard to the Fitbit Community, awesome to have you around! I'm sorry for the late response, I saw your Alta wasn't syncing after the app update.
If the issue persists, review again if the Fitbit app is updated to the most recent version. There was another release that I would like to make sure is the one you are running.
Regardless of the app update, if the issue continue it wouldn't hurt reset the Fitbit app: Log out from your Fitbit app and go to your phone settings. Access to the App manager option and look for the Fitbit app in your downloaded apps list. Once you are there, clear the app cache and data and proceed to "Force Stop" the app. (This may vary depending of the Android device and the OS version)
Finish the workaround by restarting your phone. When your phone has initialized, go back to your app and try again.
Catch you later and hope this helps.
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