Two FitBits sync conflict, neither would sync or pair

[ellochka]

I have two devices, Blaze and Flex 2, and when I use them both, the iPhone app stops syncing with either. I can add the second device fine, and it syncs for a few days, and then stops. The first device would not sync, either. I deleted both from my profile, told Bluetooth to forget them, they would not pair back. They behaved like this since I bought Flex 2 last year. Running them out of juice completely, and then pairing worked in the past, but I don't want to wait for 5 days.

[MarcoGFitbit]

Hello @ellochka, I hope you're doing well, it's nice to see you around. 

When was the last time you sync your trackers? Have you restarted them and the phone as well? Have you updated the Fitbit app? If so, I would like to suggest you to enable All-day Sync on the tracker you use the most so it maintains a constant communication with your phone. That way, even with the Bluetooth signal of the other tracker, your main one will still sync without inconveniences. To enable All-day Sync, go to Account > Your Tracker and you will find it in that tracker's options. 

Now, when you'd like to sync your secondary tracker, make sure your main one is nowhere near the secondary tracker and your phone in order to prevent that tracker to interfere with the syncing process. 

Additionally, I would like to suggest you to re-add both trackers as a new device in your account to reset the connection between them, don't worry none of the previous information stored in your account will be deleted. Please set up your main tracker first, then move it to another room and pair your secondary device. 

To set up your trackers as new devices:

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
4. When the app asks you to replace your current tracker, please replace it and continue with the process.

I hope this can be helpful, give it a try and keep me posted in case you need anything else. 

[ellochka]

Restarting the trackers did not work.

I turned the Bluetooth on the phone off and on, and both trackers were able to pair.

[MarcoGFitbit]

Hello @ellochka, I hope you're having a great day, thanks for taking the time to reply and let me know your trackers were able to pair, I'm very glad. 

In case you have some spare time, I would like to invite you to visit our Discussions board where you will find great tips and encouragement from other members and if there's anything else I can do for you, please keep me posted.

Happy stepping.