Ace 3 no longer synchs

[Neilg3]

My sons Ace 3 no longer syncs, watch says download mobile app after entering the code on the phone.

app reinstalled multiple times, unable to reset watch as can’t connect. Just will not sync.

watch is less than a year old, what’s the warranty?

[ManuFitbit]

Welcome to the community forums @Neilg3.

Thank you for taking the time to share the difficulty that you are experiencing with Ace 3.

While reviewing your information I've been informed that you already contacted the Support Team for further assistance with this. In this case, they will let you know how to proceed. Please keep in contact with them and take a look at your inbox. 

[Sa-chan]

Have you got any reply? Same thing happening to me!

[Neilg3]

Hi,

Below is the advice they provided:

Upon checking in your system, we notice that the device is unpaired. We would encourage you to check the following article: How do I set up my Fitbit device? 

1. Tap the Today tab  Then tap Devices .
2. Tap Set Up a Device.

After pairing the Ace 3, please check the syncing troubleshooting steps, by consulting Why won't my Fitbit device sync? Do not hesitate to access your iPhone Settings > Privacy > Location Services > Fitbit > select the Always option > return to settings > scroll down to access the Fitbit app > check if the Bluetooth and background app refresh are enabled.

[Sa-chan]

I just found my kid’s old iPhone SE doesn’t find ACE3 device after software update. My own iPhone can find tho.

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Oh actually I can’t pairings them now anymore. My phone also can not find Ace3.