Unable to set up tracker due to FBBluetoothErrorDomain error 3

[Jailbird]

This error is preventing me from connecting my Fitbit watch to my i phone. Who do I overcome this problem

Moderator Edit: Clarified Subject.

[MarcoGFitbit]

Hello @Jailbird, have a warm welcome to the Fitbit Community, it's great to have you on board. 

Thanks for bringing this to my attention, which tracker are you trying to set up? Which mobile device are you using at this moment? 

At this moment I would like to suggest you the following:

• Make sure you have a strong WiFi signal
• Make sure there are no other Bluetooth devices around that might interfere with the setup process. 
• Restart your tracker, then plug it in and make sure it's charging
• Restart your phone. 
• Try to set up your tracker as a new device once again:
  1. 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.
  2. 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"
  3. Choose your tracker and follow the onscreen instructions to continue

I hope this can be helpful, give it a try and if your tracker is still not able to set up, please reply to me so I can check this further. Additionally, if there's anything else I can do for you, please feel free to reply as well.