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Hello @Tdunn, have a warm welcome to the Fitbit Community, it's great to have you on board. 
Thanks for bringing this to my attention. At this moment I would like to ask you to follow these steps:
- Restart your Alta, then leave it plugged in and charging.
- Restart your phone.
- Make sure you have a strong WiFi signal.
- Make sure there are no other Bluetooth devices around as they might interfere with the setup process.
Then, please try to set up your tracker again:
- Go to the Bluetooth settings on your phone and check if your tracker is on the list of paired devices. If it is, tap on it and select Forget this Device.
- Open the Fitbit app and tap on the Account symbol at the top right corner of the screen, then tap on "Set up a New Device"
- Choose your tracker and follow the onscreen instructions to continue
In case the setup process gets stuck after you input the 4-digit code, please force-quit the app by double tapping the home button on your phone and swipe up the app. Then, try to set up the tracker again.
I hope this can be helpful, give it a try and keep me posted in case you need anything else.
Best Answer