Hello and welcome to the Fitbit Community @Amybland
I’m sorry to see your having syncing issues. Thank you for letting me know your device type. I looked it up and the iPhone 8 Plus is indeed a compatible device for the new Fitbit App. So let’s try a few troubleshooting tips to try and get you up and running again.
First let’s try restarting your Fitbit Tracker. Heres how:
https://help.fitbit.com/articles/en_US/Help_article/1186
If your still experiencing issues try turning your Bluetooth off then back on again.
If Restarting and toggling the Bluetooth doesn’t help I would suggest force shut the App and restart. Here’s how:
Turn off your Bluetooth
log out of the Fitbit App
completely shut down your device, wait 1-2 mins then restart your device
once your device fully loads enable your Bluetooth again
now log back into your Fitbit App as you normally would with your email address and password
now sync your device
If your still experiencing an issue try this: please go to the Bluetooth settings on your phone and remove the tracker. In the list of Bluetooth devices you'll see the Fitbit Tracker and next to it, this symbol "!". Hit the symbol and it will take you to the next step, once you're there select the option that says "Forget this device" or "Unpair". Once you've made sure about that, go back to the Fitbit app,, tap your profile picture then scroll down and select "Set up a Device". This should start the setup process for your device. Just follow the instructions as they come.
If the issue is not solved after the above steps, please take a look at the help articles: Why can't I set up my Fitbit device? or Why won't my Fitbit device sync?
😃 Hopefully these suggestions resolve your syncing issue. Please come back and let me know.
