I have tried countless times syncing my Fitbit Alta. Sometimes HOURS later I receive a message that it synced (not all the time though) I lost crucial workout info because it didn't sync.
I'm sorry to hear that you are experiencing difficulties syncing your Fitbit device to your Fitbit account. Please contact Fitbit customer support for further assistance: 1-877-623-4997. Once you sync your Fitbit data to your Fitbit account, the data will upload to your Go365 account within 24-48 hours.