Child account change of device

[Tombla]

I’d like to change my child’s account from my phone onto her Kindle Fire. I have the app installed on the fire but it says the ace 2 can only be used on 1 device. Am I able to take it off my phone and log in on the kindle. Will her data remain? 
When I went to remove her account from my phone it said it would be permanently deleted and all data too. 
Any help advice on how I can move her account to another device?

thank you 

[JuanJoFitbit]

@Tombla, welcome to our Fitbit Community! Regarding your inquiry about changing the Fitbit Ace 2 to your child's Kindle Fire, I'm afraid that the Kindle Fire devices are not listed in the Supported devices list. This is the reason why the option to set up a Fitbit device is not showing.

However, I'd like you to give your vote to this Feature Suggestion, which requests compatibility of this device. The more votes this request gets, the more chances it will have to be reviewed by our team.

In the meantime, you can set up the Fitbit Ace on your own device if your phone is in the list shared above.

I appreciate your patience and understanding with this.

I'll be around if any question arises.