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Hello @fitness419, have a warm welcome to the Fitbit Community, it's great to have you on board. 
If your Blaze is not syncing with your iPhone, I would like to suggest the following:
- Restart your tracker 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.
- Turn off the Bluetooth on your phone for 15 seconds, then turn it back on.
If this doesn't seem to work, my best recommendation would be setting up your tracker as a new device to reset the connection between the tracker and your phone. Don't worry, this won't delete any of the information already stored in your account.
To set up your tracker as a new 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.
I hope this can be helpful, please give it a try and keep me posted in case you need anything else. 
Best Answer