Ace 2 setup difficulty

[techdespair]

I have previously set up accounts for both of my children's fitbits. I have synced one with a phone. but it seems to be synced to the wrong child's account. How do I remedy this? I am completely confused? 

Also I have followed your advice on choosing new clock faces but it just shows a revolving circle which never goes and the same clock face remains. Please advice?

Moderator edit: subject for clarity 

[LiliyaFitbit]

Welcome to the Fitbit Community, @techdespair.

Thanks for the details shared in your post and for already trying to resolve the issue. You can confirm the steps to set up the trackers at How do I set up Fitbit Ace devices? Upon checking with our Support team, I was told that you have already contacted them. I know they will be glad to help you out and provide a solution, please keep an eye on your inbox.

I'll be around if you have any questions.