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Hello @Slyjay, thanks for joining us, it's great to have you on board! 
Have you updated the Fitbit app and restarted your tracker recently? If so, I would like to suggest the following:
- Restart your mobile devices.
- Turn off the Bluetooth in both of them and then turn it on one (iPhone or iPad but not both)
- Try to sync again.
If that doesn't seem to do the trick, please try to sync your tracker as a new device to reset the connection between your devices and the tracker.
To set it up as a new device:
- Turn off one of your devices.
- Open the Fitbit app on the other one and tap on the Account tab at the bottom of the screen, then tap on "Set up a New Device"
- Choose your tracker and follow the onscreen instructions to continue
- When the app asks you to replace your current tracker, please replace it and continue with the process.
Please give it a try and in case you need anything else, please feel free to reply! 
Best Answer