No sleep details on Ace 2

[Webbrowser]

Hi, my son and daughter both have an ace 2. My daughter has no problems but with my son, the sleeping details are not diaplayed on the Fitbit, they are only shown in the app. Synchronising also takes a lot of time as well. Any suggestions? 

Moderator edit: subject for clarity 

[LiliyaFitbit]

Welcome to the Fitbit Community, @Webbrowser.

Thank you for sharing the details of the issue you’re experiencing with your son's tracker. I recommend trying the following:

1. Restart the tracker by following the steps from this help article: How do I restart my Fitbit device?
2. Change the clock face:  

• With your tracker nearby, from the Fitbit app dashboard, tap the account icon> Ace 2 tile.
• Tap Clock Faces > All Clocks.
• Browse the available clock faces. Tap a clock face to see a detailed view.
• Tap Select to add the clock face to Ace 2. Sync the tracker. 

Regarding the issue with syncing, please confirm the steps in this help article: How does my child sync Ace or Ace 2 with their device?

Let me know how it goes.