Hello and welcome to the Fitbit Community @Chantal24
I’m a bit confused about the wording of your post so please forgive me if I misunderstand. I understand you got a new iPhone 11 and your having difficulty with pairing to your Fitbit Charge 3. (My confusion is with your mention of the iPhone 7 and factory reset of that phone) My question would be are you trying to pair with the iPhone 7 or the iPhone 11?
Please keep in mind that having your Charge 3 paired with two devices can cause conflicts so I would choose which iPhone you desire to pair with and make sure you are NOT paired with the other one.
Here are some steps you can take to try to get you up and running again:
First let’s try restarting your Fitbit Tracker. Here’s how: https://help.fitbit.com/articles/en_US/Help_article/1186
If your still experiencing issues try turning your Bluetooth off, restart your iPhone then turn your Bluetooth back on again once your iPhone restarts. Again, try to sync
If restarting and toggling the Bluetooth doesn’t help I would suggest force shut the App and restart. Here’s how:
Again, 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 syncing is still failing let’s try reinstalling the Fitbit App. You will not lose your data doing this.
Here’s how:
1. Log out of the Fitbit app and force shut the app by swiping up
2. uninstall the Fitbit App from your device
3. now completely shut down your device and wait about 1 min then restart your device
4. once your device has reloaded reinstall the Fitbit app by downloading it from the App Store
5. once it’s installed, log into your device as you normally would with username and password
6. don’t touch anything in the app...just wait until you get a prompt from your Bluetooth.
7. When prompted by your Bluetooth tap yes
8. now try to sync
If your still experiencing an issue try this last step: 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?
Now as far as your notifications issues. I do understand it’s frustrating and disappointing that your experiencing problems. Currently notifications are an issue that the Fitbit Team is aware of and are working on a fix. Please view this thread here: https://community.fitbit.com/t5/iOS-App/Stopped-seeing-notifications-after-updating-to-iOS-13/m-p/39...Pay special attention to page one of that thread and perform all the steps carefully. If any new updates or information become available it will be posted there.
😃 I do hope my suggestions do indeed help you pair your Charge 3. Hopefully trying all the steps provided to you in the link will resolve your notifications issues as well. Keep me posted.
