Fitbit Ace 2 trackers won't sync to phone

[eddie365]

I have 3 children, all with an Ace 2.  All are paired with Apple phone and all, at some time or another have synced, BUT, it is increasingly difficult to make this work.

Recently, only one of them would sync.

Phone is on latest iOS. I removed all of the parings from the phone, I removed all of them from the App, I hard closed the app, I re-paired everything (making sure each fitbit was in a room alone with the phone each time), and it worked.  It took a long time, but they all synced. Once.

Now I have the same problem every time I try to sync them to the phone, it just can't 'find' their fitbits.

I don't need to know how to pair, I can do that, but I need to know why it can't work consistently? The fitbit app is woeful anyway (needing to log in and out of each child account via the parent view), but the children have expensive Ace 2's that are only effective as glorified step counters at the moment.  

Please, any advice welcomed, as this is very irritating.

Moderator edit: subject for clarity

[LiliyaFitbit]

Welcome to the Fitbit Community, @eddie365. I am sorry for the delayed response.

I appreciate your participation in the Forums and sharing the difficulty you'e experiencing syncing the Ace 2 trackers. Thanks for trying to resolve this, I appreciate the additional details and I am here to help. I totally understand how you are feeling and appreciate your feedback. Our team is always working on our products and services, and your comments are always welcome. I would like to advise that we were experiencing an issue affecting our users to sync or pair devices, however it has been now resolved. Please confirm if you're still unable to sync the Ace 2 trackers. 

You can double check the steps to sync the Ace 2 trackers in this help article: How do I sync Ace or Ace 2 with my device?

For general troubleshooting instructions to resolve the syncing issue, see Why won't my Fitbit device sync? 

Looking forward to hearing back from you.