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Hello @aweather, thanks for joining the Fitbit Community, it's great to have you on board. 
Thanks for bringing this to my attention, I appreciate you have let me know the troubleshooting steps you have tried in order to try to resolve this issue. At this moment I would like to suggest you the following:
- Restart your Blaze by pressing and holding the Back and Select buttons (left and bottom right) until you see the Fitbit logo on the screen.
- Restart your phone
- Make sure you have a strong WiFi signal
- Make sure there a no other Bluetooth devices around that might interfere with the syncing process.
If after trying these steps your Blaze is still not syncing, my best recommendation would be setting up your tracker as a new device to reset the connection between your tracker and your phone. Don't worry, none of the information already stored in your account will be deleted.
To set up your tracker as a new device:
- 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
- When the app asks you to replace your current tracker, please replace it and continue with the process.
- When a pop-up appears asking you to Pair your tracker to your device, tap on Pair and continue.
I hope this can be helpful, give it a try and keep me posted in case you need anything else. 
Best Answer